IGN: crazi
(Proudly legitimate on that account)

The only thing I recommend against is buying NX "specs". They sound like fun, but specs really aren't. You get kicked out of every game using the M32, and people call you spec noob for using other specialist weapons. You can achieve the speed boosts easily by buying cyclops/recon vest.
(I've used specialists before)

What do I recommend, though?
I recommend that you only buy NX weapons and gear. Don't buy them for permanent, until you've tried them for 1 week, to know their strength and weaknesses.
YouTube - Kanaal van miphisto55
This person gives great video reviews on general guns. WATCH THEM!

(Don't buy Cases or Black-Hisecs or Renewal Kits, since buying NX standard weapons is almost always better than the results from these guns)

I don't know how you play, but you should factor in how you play as a precedent on what guns you buy.