Xbox 360 purchase questions

Hi, so i was seriously thinking of buying a 360 once i can afford one, but the question is, how much should i sink into one? Do i go the full $400 for an elite? $300 for a pro, or or $200 for an arcade? There's of course always used options, which could get an original 20gb for $150 or less. One deal i found had a pro w/ a 60 gb drive for $200.If i were to get an arcade, would the small 256mb of space last me, or would i have to invest another $40-90 on a bigger hard drive?

Well, do you want a bunch of arcade games with it? If so then you should get an Arcade and invest in a 20Gb hard drive if not i'd go with a single used core for 100 or a little over and buy a hard drive

im also gonna buy a 360. but im just gonna get a used one so i can afford controllers and stuff. haha! i know im lame