If they raise the price of games above $59.99USD, I won't buy either console, until many years later. It is nice getting almost anything I want for the PS3 for $20 or half off on PSN titles in sales
If they stay at current standard prices, or go to a better stratified pricing model (I can only dream), than I'd be willing to spend $400USD before taxes. Maybe $500 if it's a really spiffy SKU (or includes an interesting game). Will likely choose the PS4, but we'll see.
Another idea bopping around in my head, is that I'll stick to primarily PC gaming, along with my handhelds. Plus, I'll buy a WiiU if enough interesting stuff actually comes out and there's a price reduction or bundle at some point.
Either of these is what I'll probably do:
1) Build new PC within next year and a half. Buy WiiU upon price drop et al. Keep handheld gaming too.
2) Buy PS4 if price is not insane and it has 2+ good launch titles. Ignore PC's waning performance for as long as possible, and continue playing handhelds.