Bah!!! I've been saying for YEARS that Parallels is a ripoff. VirtualBox owns all - and its cross platform, runs on Windows, Linux or OSX. I even had a thread fight with Jay Maynard over it, because he was as obsessed as every other Mac user over Parallels.
Yeah, it works well for anything that doesn't require graphics acceleration. Get into doing something like trying to play a Windows game that's graphics intensive on a Mac, and you'll want Parallels or VMWare. Which one you want, probably depends on the day and which of the million dot-patch levels they all constantly put out, that you're running. What patch level of the game, too.
(Joke: "I just came from the men's room." "Oh yeah, was that a software or a firmware release today?")
Most "geek stuff" as you put it, just the need to run multiple OS's on a box, VirtualBox works fine. VirtualBox (because it was Sun's code before they were bought by Oracle) can also host various flavors of Solaris, something the others don't do very well at all, but there are some annoying limitations, like ... we had a VERY nice 64-bit Sun box sitting here (Enterprise class), but couldn't run 32-bit Windows inside VMs on it. Too bad, since it would have been even faster than the pizza-box cast-off-from-IT that we ultimately used to host the Windoze VM's.
I use AVG Free edition and Malwarebytes and never have a problem anymore.
I got tired of AVG begging me to pay for the full version, and I also had some weird crashes when it would do full scans, which being a "free" version there was no support for. Their forums were useless on the topic, but other's had seen it.
Then I read a couple of security trade-rag articles about how Microsoft's security division had slowly and quietly created their own antivirus and other tools, but didn't market them heavily because a) people tend to not believe that the fox will guard the hen-house, and b) they have too many "business partners" that make anti-virus software for their crappy vulnerable OS, and they didn't want to tick those "partners" off... big money selling AV software to business these days, ya know?
But... at the end of the day, a number of 3rd party security experts pointed out that Microsoft Security Essentials did just as good or better of a job detecting virii as did many PAY versions of software, utilizing less system resources to do it. (McAfee, I'm looking at you, you pig-dog system killer. Hate. Hate. Hate.)
Many people don't realize that MS Security Essentials is a free download for XP... and think it's only available on Vista and 7. It's free, works great, and doesn't have limitations on it that the vendors like to put on their "free" versions like "Thou shalt only run manual scans, and if you want scheduled scans thou shalt buy the pay version".
Been running the MS stuff now, and removed all others, on the very few Windows machines and VMs I need for things, which is slowly now down to one Windows VM... and it lives on my MacBook...
Even stranger, I haven't booted the MacBook again in a month, with the iPad handling far more than the 80/20 rule than I thought it would. It's a very powerful little tablet. Doing more with it than I ever expected.
The Windows VM inside that MacBook that hasn't been booted, of course, hasn't booted for at least two months. In fact, the biggest pain right now is booting all of these OS's and things I'm NOT using up at least once a month to catch critical security patches. LOL. Tonight is probably that night, since I'm a geek and have such big plans for a Friday night. HA!
For the few things I do on a "real computer" right now... recording/editing the podcast, via Skype, etc... I just log in as a second user on my wife's iMac that sits in the living room... on the coffee table.
The whole concept of going to the "Computer Desk" in the basement has been busted for almost a year at my house... I've been slowly disassembling the machines, and selling them off or recycling them. I just sit on the couch with the iPad.
Was looking last night at MacBook Pro prices, and realizing that I'm probably never going to do it unless I need to video edit on the road... no need for a screamer laptop when you have the iPad... unless you were doing mobile A/V editing.
Especially now that Pages/Numbers are out for iPad... can write, and do spreadsheets, and put 'em up in DropBox... I don't really need to carry a laptop anymore, but I still drag it around in the backpack out of habit, and never boot it. LOL!