firstlly welcome, feel at home here.
Depends what type of paintball you're into. i would suggest that a tourney type marker would be best as it would allow you to play all types of games rather than limit yopurself to woodsball etc
For that price second hand is definately the way forward. You can find alot of second hand rails, ions and minis for that price. If you really search and get a bit lucky you might come across a early geo/ego.
Just have a look round the classifieds
Ive said it before to others and ill say it here, dont be fooled into buyimg a marker and chucking money at it for uprgades. get a sorted marker save the cash and spend on paint instead. Most markers sold on this would happliy keep up with the various site restrictions on BPS.
Try and find one with a LCD display as it so much easier to set the marker up rather than counting blinking lights. Dont be put off by anno wear and certainly dont be put off by a marker having had 50,000 balls through it. That just means its properly sorted and should be shooting really smoothly.
Any money saved buying a marker put towards paint or a really good mask. There is no substitute for a good mask - ive tried