I would not suggest the Tippmann A-5, at least not for speedball. Out of that list, I would pick the invert mini or the proto matrix rail. Both are extremely good guns. The invert mini's advantage is that it is very light and small. The proto matrix ...
Yes, the Proto Matrix 6 is an awesome marker and top of the line... it is made by Dye.... so you cant go wrong... for the price it is a very good deal... if you can find one new for 390 they are giving them away..... so get one. :)
my son had a paintball party @local paintball place. so much fun, kind of expensive since so much equipment involved- head gear, pb guns & even the ammo is $. look under party planners in book.