Well Chromehounds would be a cheap good mech game. Though you've missed out on the online community since they closed down the servers so it's mostly just going to be campaign missions which were basically tutorials for online. Hawken is your best choice right now for graphics and game play. Armored Core Verdict Day is supposed to be better than V but I have no idea when it's coming out of Japan. Mechwarrior online is available. Fall of Cyberton is awesome but it's transformers but after playing the demo the online multiplayer was a blast to play.