<p>Depends how much money you have to spend. Apple has and always will be horrendously overpriced for the hardware you get (3-4x as expensive for comparable specs) but for that you have a bit more stability if you have no idea how to tweak a PC.</p>
<p>Look for something with 2-4 gigs of ram, decent processor 2.1 dual core, discrete graphics. That should run anything you could ever possible want.</p>