If you leave it stock and just put many miles on it you have spent your money wisely, few of us do, upgraditis usually strikes.
My FELT F90 cost me around $700.00, I am now up to $1500.00 total investment, I now have a very nice bike, BUt not as nice if I had walked in the lbs with $1500.00 in my grubby little hands.
So buying the expensive bike first might make sense.