talkpsp.com was worth more than both simply because the psp is a new product. The owner of talkps2 had a very hard time selling it and only managed to get $20 for it. I think talkplaystation is a great domain (if a little long) however the playstation is a reasonably old console, sure you can argue it is for ps and ps2 but i simply can't see a huge value in it (if there were, you wouldn't have been able to register it!).

I believe you could sell it for $25-50 on namepros/dnforum to the right person! Good luck.