q66 to e8xx?

I use my rig for:
-surfing
-programming
-gaming
-downloading
-maybe a bit of photoshoping

I want best performance/watt.

Should i go with e85 or not?

buy E8500, it's cheap & fast.

Programming? Unless you're doing a lot of it, nothing you're using your rig for is particularly multi-core optimised. You'll get better perceived performance/watt from a Wolfdale.

E8400 is the best choice for you.