Definitely don't get something that isn't in your comfort zone. Also take advantage of your compatriots here on the board and see if anyone is near a potential purchase to go take a looksee. Also check CarMax and see what they have since you can take it back in 5 days if it's a dud.
I've sold and purchased several vehicles on eBay and you really need to do your homework, pop the $20 for a full CarFax (they have a guarantee) and check feedback. Deals can be had, just just screw yourself with impatience.