So herez my take on this:

2009 IS 250 - 55k miles $23K
- Good choice
- Since its made by toyota,should be pretty good on parts and labor costs
- also make sure what types of maintenence the owner has done so far
- when does the warranty expire?
- it is a rear wheelvdrive car so might not be the best choice for snowy states..

2011 Audi A4- 26k miles -$26k
- its an audi..
- will come with all the bells and whistles
- lot less miles than is 250
- does not mean that a german car will crap out after warranty expires..depends on the owner..if you do scheduled maintainence.. you will be fine..
- all wheel drive definitely helps in snow..

2012 Camry- 13k miles- $17k
- nothing against camry but it is a boring car
- i would not buy it.