I gave you a suggestion:
http://forums.turbobricks.com/showpost.php?p=2191371&postcount=39
That's the mill that I have and it's great, although it depends on what your goals for it are. If you need something physically bigger then maybe look into a used older one, but it'll still be more money than that one. That guy Hoss has figured out how to double the X and Y travel, making his work area way way bigger! I'm totally doing that too, along with my CNC upgrade.
If you want to make some awesome intricate parts then I'd highly suggest a CNC conversion. Imagine trying to mill a circle by hand, it's a lot like using an etch-a-sketch, you only have left/right and in/out (and of course up/down for height). Stuff like intake/exhaust flanges would be cake on a cnc mill, and with the table upgrades then that one will be big enough. That little mill plus $1,500 in tools and cnc conversion parts will get you an incredibly awesome package. But be careful cause machining can get expensive real quick, you can get cheap tools but they're cheap in both senses of the word. If you want to buy tooling that doesn't wear out quickly then they add up quickly!
But I tell ya, it's way too much fun having all these tools.