I've been looking to buy a tube half stack with a heavy, powerful, metal-sounding overdrive (like the Peavey Valveking or the B-52 AT), but that's a little tough on my budget, so some have suggested just getting a cab to use with my 15 tube watt (180 SS W) Fender Blues Junior Tube Combo, which I'd assume would mean using my Electro-Harmonix Metal Muff to get the sound I want like I do now. Is this a good idea? And what cab would you suggest?