Opinions? : FPS / MMORPG / RTS Discussion

Well I've been looking for some more MMORPGs to play and I'm really low on cash and what not. Are there any good free ones (If you have to buy it (like GW) and not pay after? I have GW and am downloading Hero online as I'm writing this. I also looked at Ragnaraok, Knight Online and Anarchy Online. Any suggestions would be great! Thanks guys