Fair enough - they are good for games.
Well, to give you some feedback that should resonate with you - since buying my rMB I have redesigned and launched my own blog. The rMB was a big part of my inspiration to do that. Something I've wanted to do for months.
With regards to upgrades - it's your money and no-one here should tell you what to do with it. I'm like you - I have never bought a Mac that wasn't top, or near top, spec before...until this one.
Reason being, in my view, the rMB is destined to last two years. It's going to struggle to go any further. 200MHz isn't going to be the difference between 2 and 3 years this time. With the iMac or rMBP range, that can sometimes be the case with processor upgrades.
There's also no tangible differences between the 1.3 and 1.1, which isn't the same as upgrading to an i7 over an i5, for example, which has significant benefits for some uses like video editing.
The final nail in the coffin is the 6 week wait for the 1.3, vs. the walk-in availability in the UK for the 1.1 and 1.2 models.
Just my $0.02. Ultimately, you've done your own research, and whatever you choose, I'm sure you'll love it.