Besides the pricetag 6 g's above what you said was your absolute price cieling?
Looks like that one is a better starting point. Seems a little steep for 60k miles though...
It sounds like you are sold on a stock WRX already, but I just wanted to drive the point home real quick.
I got mine for 12k with 100k miles. I firgured it didn't matter since like you said, it already had everything I wanted done. An STI block and turbo swap, pink injectors, perrin hoses and fuel rails, brakes and suspension, and CF hood and trunk. Then 2 weeks later the transmission blew from being railed on. Now I'm rebuilding my engine because my #4 piston broke. I'm now 19 grand into it. Go stock, and make sure it had a responsible owner.