I'd like to gain more volume by hooking up a 4x10' cab to my 200 watts Tech Soundsystems amp. I found a homemade 2x15 cab in the trash a while ago but the darn thing simply doesn't cut it, it sounds flat-out terrible and it vibrates way too much. My combo amp has two inbuilt 10' speakers and a minimum load of 4 ohms. If I'm lucky and the inbuilt 2x10' speakers' impendance is high enough (I can't find its impedance data anywhere, though, I emailed the manufacturer a while ago, they ought to be able to help) I should be able to use both the inbuilt speaker and an extra cab with 8 ohms, right? If I find I still need more volume, I'm planning to get a new head also. To get back to the beginning, I'm planning to spend about 450 Euros max on an 8 ohms 4x10' inch cab. What would you recommend? Peavey? Warwick? Hartke? Oh, I like clean and modern sounds if that helps any. Lots of thanks in advance.