I had an e60 535i and now have an f30 335i.
My E60 handled just as we'll as my F30 and was on par with the f30 as far as power. IMHO, aside from new interior upgrades (which are very nice in the F30), they are very similar driving cars. I actually miss my E60. It looked awesome from every angle and had the best seats. The only thing that I didn't like on the E60 were the climate knobs and the crappy shift paddles. the e90 and f30 paddles are way more functional.
The amber halo lights on the e60 are getting a little dated though.
You have a tough decision to make. The major PLUS with the F30 is the technology advancements. driving wise, cars are very similar.
2008 BMW 335i Retired
2009 BMW 535i Retired
2012 F30 335i sportline (Black Sapphire/Black Leatherette/Black High gloss trim, Technology, Sport Auto, Premium Sound, BMW Apps.)