Get a pre-hackintoshed Dell Mini 10v and hook it up to a 250GB HD, external display, keyboard and mouse = Really fantastic budget Mac.
Have a look at eBay, they do the Dell Mini 10v really cheap for about £140 inc p&p. That's approximately $230 in the US. They are pre-hackintoshed as well. I'm getting one for my birthday!! 4 weeks on Saturday!
They are really good, I've not got the Dell Mini 10v just yet but I've watched reviews on YouTube and they are supposed to be really good hackintoshes. I've got a keyboard and headset already all I need for the setup is: Dell Mini 10v Mouse External Hard Drive (250GB) You can actually pick up a Logitech keyboard for about £10 and a Logitech mouse for about £7. As for the headset I got some Plantronics GameCon 367 headsets for £18.22 (awesome sound!). The hard drive I haven't got yet, but you can pick them up from Amazon really cheap. eBay and Amazon are your best bet for getting cheap stuff. Especially eBay because of the fact there are already pre-hackintoshes on there! Hope this helped!! Ohh yeah and as a bonus, if you are a MineCraft player, get the OptiFine mod, it improves the FPS by playing with the fog!
Thanks Jayden in bidding in a mini 10v now I have a spare USB keyboard so no worries there but I'll need the rest