sdsubaru

I have a 2007 imprezza sedan. It's pretty good and meets all our rquirements except that it's a little small and I'd like to upgrade. I'm looking at a 2010 legacy 2.5 I with 35k miles. Can anyone tell me if the legacy will be a very noticeable upgrade? I know its the first year for that look, so are there any major issues fixed in the later years (2011+)? Also, what can I expect to sell my imprezza for either at dealer or privately? The legacy is goign for $14k before taxes. I'd like to pay < $5k total for the upgrade, but not sure how realistic that is.