I have played about 10 times and would like to get my own gun now. I have read alot about different guns and up grades. Looking to get a decent gun. Don't need any $1000+ pro level marker, but want something better than a rental or WalMart speacial. The following is a short list of what I have looked at:
Tippmann's 98 Custom (and pro)
Spyder Electra
Autococker 05 Prostock
Smartparts Ion
Bob long GZ Intimidator DM6
Would like something that can run on either CO2, Compressed Air, or Nitro. I know the 98 C if very customizable, but do not know the difference between the response trigger and the E grip. Have no clue what an expansion chamber if for. I like the ACS systems or even Eyes. Like to get something that shoots fast, so as I improve, the gun will be there and not have to upgrade again. Looking for an accurate marker that shoots a decent distance. Looking to buy used, but would not rule out new. My price range is from $ Free to $500.
Please clue this noob in.

I guess it depends on what kind of play you want to get into.

For woodsball:
there is no reason to spend too much money, on a paintball marker, to play woodsball. You would be fine something along the lines of a Tippmann 98C, or Tippmann A-5, or even a Spyder, and Ion. All of those markers can be run off of Compressed air or CO2.

For Speedball:
If you wanted to buy a tippmann for speedball, I would recommend the A-5 with E-trigger. Other's include the Smart Parts ION, and the Indian Creek Design (ICD) Promaster ( http://www.icdpaintball.com/icd05/intro.asp ). The Promaster I think runs $300-$400? I don't really remember. I'm not a big fan of Spyders. Also, you could look at the Bob Long Defiant, which I don't think is too expensive. And you could always buy a used high end marker. you can find some nice one's for pretty cheap.

But, like I always say, check out your local paintball proshop. Those guys tend to know a lot and need all the support they can get. They will definately be able to help you out first hand.

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Yeah i've got a gun..just too lazy to tell you about it.