tippman's are good entry level markers for the price, however if you're looking to spend a bit more, i would recommend this:
http://www.spyder.tv/section/product...ies/pilot.html
People complain that kingman's markers break down kind of easily, but i never had any problems when i used the older version of that gun for about 18 months.
I currently use this because my friend is on a semi-pro team in Detriot and has sponsorships, meaning i get free stuff.
http://www.sakworldpaintball.com/ionxepagun.html