MBP 2.5 Core 2 Duo to MBA i7 - Upgrade or Downgrade??

my current macbook pro 15.4 3.5 years old...it has 2.5 ghz core 2 duo processor, 4 gb ram, , nvidia 8600m gt 512 mb video card....so im curious..if "upgrade" macbook air, 13 inch, i7 processor, 4gb ram, intel hd 3000 graphics, etc....am "upgrading" or "downgrading"???

plan on using macbook air desktop connected apple 27inch thunderbolt display...giving me both desktop , laptop if want portability.

know processor faster, loosing graphics? oh..i use mac ordinary everyday tasks....only thing google earth or google street view in maps...that kind of 3d though going miss discrete video card?

know save money , go imac route...but imac seems "ordinary" , love apple design , mba.

thoughts.

 

google earth run on intel 3000 hd.
faster/slower, here:
mac benchmarks geekbench

ps: due ssd inside mba, mba feels @ least faster during everyday tasks.
i7 faster c2d too.

 

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