Casual gamer here buying a 360. Needs help with some basic questions.

I've been a casual gamer, but now I'm getting more into them, and I have some questions:

• Are there any major setbacks to buying a refurbished 360 from a reputable store (are they known to break down, etc.)?
• IYO, is it worth the extra $100 to get a 250GB hard drive instead of a 4GB?
• IYO, are there any games out that make an extra $100 for the Kinect worth it?
• Finally, I believe that 360 controllers work with the PC, but do wireless 360 controllers work with a PC?

I know you may have seen these questions a thousand times over, but your help is greatly appreciated, brothers :).

Thanks Dude. I think the rules in the 360 board said not to post hardware advice there, so I didn't have a lot of options, lol.