I'd do 16gigs of ram over the i7 processor. In the processor tests I saw, the i7 was barely any better than the i5. I believe it was a mere 2-3% slower.
The ONLY time I could get the 13" MacBook Pro 8gig to lag is when I had 32 apps open with like 27 tabs. Then 15 in chrome. Mind you, chrome is NOT any sorts optimized, and the apple audience have constantly stated that it should not be used unless absolutely required.
I need chrome for one application, so I have it and use it for just that single sight.