O.K. so I have narrowed it down to a few options,
15in Mid 2011 quad 2.4 i7 high-res anti-glare 8GB RAM for $799
15in Mid 2012 quad 2.3 i7 Retina 2.3GHz 8GB RAM for $890 OBO
17in Mid 2010 Dual i7 Anti-Glare 8GB for $699
My biggest concern is with the dual Core i7, i'm coming from a mid 2009 C2D 2.GHz, would the perfromance be more or less the same?