another thing to think about OP
if you screw the next update, and start using your MBP NOW, you might be more than satisfied.
im assuming you are going to buy applecare, and lets suppose (lets just pretend/suppose/ imagine) that 2 years from now, you MBP is all messed up and you take it to the Apple Store and they said,"hmm. we cant replace this computer, nor can we fix it."
so what do you do, you wait a minute thinking hard.
the employee goes to the manger's office and comes out after 2 minutes and he/she says, "well i talked to the manger and he/she said that we will give you a free MBP, brand new"
now this is quite rare, unless of course you attack the applecare contract and find loopholes, etc and how exactly to make sure you get a new computer through the apple store, without paying a buck. but still if this circumstance does arise, which as i said we are "PRETENDING" than you got a great computer for free.
and if this does not work out and nothing ever goes wrong with your MBP and it continues to stay nice as speedy, well you got a beautiful computer and so you should stop thinking about MBP 2011.