The 13" comps are dual core. They will work, but you'll like the 15" 2.2ghz quad core better. You don't need 16gbs of ram, just 8gb and buy crucial (www.crucial.com)
costs like 45 bucks for an 8gb kit.
Both 13" or 15" will work, but if you can afford the 15" id get that.
Evan Heath Visual
Check out Why Bother? A short ski film by Evan Heath and Scott Cardoza
"she spins left because she has no rights" - Su[G]ar