I have a G1000 182, mines a 2012 182T, I love it. I am a big proponent of the glass and modern avionics as while round dials are fun and all I truly enjoy the added safety features of having most everything integrated, traffic etc ...especially terrain if you are flying in mountainous areas with the synthetic vision (if you find one with that option), having aural queues and visual warnings for most things I think increases safety a bit and I like it. I also really enjoy having the xm weather right on the moving map as its increased the useful time on my 182 by far, that's something you could of course get on a handheld unit you just as others have said need to determine if you want that integrated or not and what its worth to you. With a modern one its likely to be a bit faster than the older models, even the T version gained a few extra knots over the S model with the same engine. as for maintenance cost I'd say it depends how new you are getting, I got mine new so I had the two year factory warranty so my mx costs were basically non-existent over the first 2 years besides the normal oil changes and wear and tear problems. mine has now been out of warranty for a bit now and fortunately the mx costs have been relatively low (knock on wood). I wouldn't really think there would be much mx cost difference between a newer model or an older model, then again your mileage may vary on that one, like cars some are good some just aren't. Now as for useful load it is a fact that these birds got fatter over the years and you would have slightly more useful load on older models compared to newer versions. My bird is well equipped and my useful load on my specific airplane is 1,076lbs. Not bad at all, but older models such as the Q would likely have a slightly higher useful load. Two things to mention, as the poster above me stated, make usre its already WAAS equipped if you go G1000, and also if you can find one with the integrated autopilot, the GFC700 I think you'd like it alot, I've flown many GFC700 equipped ones and others that had autopilot just not the integrated one, and the GFC700 works far smoother. Either way I think you would enjoy your airplane, its a great going places plane, I may be biased but my vote would go torwards a G1000 equipped plane. If you'd like some more info on my personal experience and what not feel free to shoot me a message.