pretty much any mid to high grade HU from pioneer, alpine, or eclipse is good stuff. just look for the features you want. I prefer the Alpines Ipod controls but Pioneer is getting better.
i would take your money and put it where you will see the most gains. deaden your doors first and then save up a little bit and get into components, your going to need to send more power than what the HU has to offer anyway so IMO do the components and amp at the same time.