I used to play at sab walkons very regularly until (like arg) joined a team so tournies and practice mean i can't get down to sab as much as i would like.
It's great fun and a good group of guys, Paul will look after you well!
Possibly get some kit minus the marker (or leave off buying the kit for the moment) and then get down to a sab walkon ad ask nicely to have go with some of the guys markers. I know Paul inprticular has a PMR and theres a few guys with PM7's and the likes.
As for a marker, PERSONALLY i don't really like the ions / epiphany's etc. I would go for the proto range. PMR or a PM7 off of here is seriously a good deal! the pm7's are going for as cheap as £150 on here and thats cheap as chips
But yeah again, clssifieds is the way to go! (not from the states! if you're buying new support UK shops
www.lpspaitball.biz do some awsom get out and play kits specifially the mini one i think sounds like its in your budget. but if you dont like the look of some give them a call and they'll make one up for you with a nice discount
)
mask, yeah go for a good mask not a cheap one. Paul's / Sab's are an upgrade from the rentals, and they do work well but you will find yourself upgrading after a little while.
I would recommend the JT line - Proflex's or flex's. Empire - Events. Dye - I3's. Vforce - Profilers or Grillz. Infact I have some Events for sale if you're interested
Also, bottles. Go for a fibrewrap (probably be wanting a 1.1) from the forums £60 - £90 they usually go for depending on test. or a new one for around £120 - £130ish