Hey buddy
I would say get the PMR, its the better of the two guns, more air efficent and people are more fimiliar with the innards of one to help you out whichever field you go to.
A second hand ETEK would also be a very good investment, although i haven't seen many cheap ones about.
Rates of fire doesn't mean much nowadays, everything caped to 10.5 balls per second on millennium ramping where ever you go. Your current Loader can handle this but if you want to get a new loader then its either going to be a Rotor £120 or a Second hand Halo/Reloader B for around £40. Choice is yours, i have ownd both and never had problems... well my halo ate battries like crazy, the rotors much better on batts imo
Where I'd ask questions is about your own gear.
1)do you have a anti-fog comfortable mask
2)Knee and Arm Pads
3)do you have an air tank with a bottle cover (although not essential)
4)comfortable battle pack?
5)pots for the pack
After you get those sorted, then pimp out your clothing any which way you like, half the games about looking cool!
Bricket wood is where the Funs at if you already have Sup'air experiance. a couple of good teams are around like Tigers2 (if you ask TwizzECI) and Relentless Kids (if you ask Gran nicely) none of these teams bite, just make yourself very approachable, don't be shy and ask questions.
Weblink for Bricket:
http://www.p8ntballer-forums.com/vb/showthread.php?p=1229761#post1229761
There is another option, if you want to just have fun with a really nice group of guys:
http://www.p8ntballer-forums.com/vb/showthread.php?t=118531 - Contact SimonGiles - super friendly guy, give him a buzz if you want to know more about what hes all about
Hope this helps and hopefully you'll be playing a tourney and really enjoying yourself in the summertime!