What attracts you to the 310? I'm curious. While we're at it, which 310 variant do you like best? It seems that they went through a boatload of changes over the years.
Well, as one of the local 310 drivers, I can give my opinion.
The 310 has a good blend of speed and economy. We're getting about 180 kts @ 26 gph combined LOP on ours with 520s, including some draggy features like boots and VGs. It's fun and sporty to fly. Good interior space and comfort for 4, can hold 6. Wing lockers give you good storage. Looks good on the ramp to most. They're priced attractively, and you can get a lot of plane for not a lot of money, plus there are some good performance upgrades.
The Q and R have a slightly larger cabin with a rear window, which is nice. R has nose baggage. I've never flown a Q, but the R is significantly heavier on the controls than the N that I fly, I'm not sure why.
I like the N quite a bit. The short nose fits into hangars better, and the body is less draggy than the R so it's more efficient. Flies sporty, has wing lockers, and also has the large rear baggage door. The early baggage door is about worthless, and makes it hard to load up.
The Rs have cowl flaps, the earlier ones don't. Not a big deal either way, but it's somewhat nice not having the extra parts to deal with.
Cessna got a lot of things right with the 310. It's a shame they stopped building them.