Are you going for modeling, mate? Sounds good! If you are still considering it, if you havent already started learning your way around Maya, I would recommend you try Blender instead. Not only because it is free and open source, and because of all the online help, but because it is capable of pretty much anything you might want to do and it is also pretty light on your hardware, to boot. I mean, Im using an office laptop right now, several years old, integrated graphics card, and I can do all my professional work with it (as far as modeling for architecture) without a problem, including rendering. Some really heavy modeling can be an issue (stuff from a million polys onwards) when you have my kind of hardware, but any up to date system would be up for a lot more than that no problem. Very rarely would you go very very high poly if you are modeling for games, unless you are working with character sculpting and or environment/landscape modeling, or maybe when fooling around with 3d scans. Even then that are several steps that you can do to make it workable, and that is regardless of what software you are using. Anyway, just wanted to point that out, in case you are still wondering. I had a tough time learning it but now I have a blast, it is awesome.
If you are commited to maya, Im sure other guys will know more about its hardware requirements