Hey, long-time reader, first time poster here. Recently I purchased a GK Backline 600. I've owned two separate combo amps and lately we've been playing more shows without PA support. I can't compete with a drummer and two guitars playing through Marshall half stacks. I feel like I've read almost every posting on this forum about the right combos of 4x10 cabinets paired with the amp and I've been searching for good quality cabinets on the used market, but either I'm looking in the wrong places, or a good quality used cabinet is hard to find locally. Instinct says to go with a 4ohm cabinet (300 watts at 4ohm, 180 watts at 8ohm) but I could be persuaded to purchase an 8ohm cabinet if it pushed enough quality sound. Anyways....Two questions here: #1. Other than this forum and Craigslist, where is another good place to find local used gear? (I'm in the Houston area.) #2. I think my 4x10 cabinet search has been narrowed down to a GK cabinet (preferably one of the higher-end models), a Fender Rumble 410, or my preference an Ampeg SVT-410HLF. Which of these three would I be MOST LIKELY to find in the $300 range and is there a cabinet around that price that I should add to my search list? I play two basses, a Jazz and a Musicman Stingray (both 4 string) and I'm in a punk band if that helps with style and sound. I prefer lots of mids in my bass hence the love for the Stingray. I "feel" like I need a cabinet with a horn, but I'm open to something that fits my style of playing. Thanks everyone! Brian.