all these things, and being a fist gen body hatch, make me say maybe a year older with less miles..

none of those things scare me for the right deal, but that car (eliminating the year) sounds like $3500-4000 AVEO regardless, being a 2008 makes it slightly better. but not worth more. Thymeclock hit the nail on the head of what those issues could be, but it really depends on your comfort level etc. I for one would offer less, the price of the tranny fluid change and a brake job AT LEAST. Then i would pull the valve cover to see if it is damaged, (clean it a bit) and then run better oil and more frequent changes for a while.

but its all what you are comfortable with. will to work on, have fixed, etc. As those issues sound more like high mile car issues than aveo specific.