My parents are being super generous and since my band is getting gigs they want to help me. I have bought all my gear, so this is strange and great they they are wanting to. My gear. Peavey Mark IV 210 watts Avatar 2x10 4 ohms Fender P bass special thats the info you need to know for this problem. My parents where going to buy me a acoustic bass guitar, and i told them i would rather get help and make my amp better. On the way, still waitng for the guy to get my mom, is a QSC PLX1202. I want to run it with a Tech 21 RBI. But in the mean time i can just use the peaveys pre amp. Should i get them to help me buy the RBI off ebay and the rack? Or should i get them to go in on a cab with me? I have a 2x10 and i really want to get a 1x15 or maybe a 2x12. Im looking at avatar since i have one, they will stack nice. But Dr Bass has very nice stuff, same speakers but lighter and not the same box. Im thinking that i can get the amp done by myself in the next month or so. So im thinking more about the cab. I would run it with my 2x10 so what should i get? a 15 or 12's? What company should i get? I play in a rock n roll band, and i want a deep rich sound. so im thinking that the 15 will be great. Any ideas? thanks for your help.