You been real busy lately Blue!
As I see it you are somewhere between a rock and a hard place. You have an amp and a cabinet that you are not happy with. Problem is you don't know which part is causing your woes and, to top it off, you ain't got too much money to splash around. We've ALL been there at one time or another.
Jhaz's advice is very valid. You have to diagnose where your problems lie. If you try other cabinets and they all sound similar with your amp then change the amp for something that works for you.
If it's your cabinet then again you have to find one you like. Unfortunately you are the only one who can identify what you are looking for. You're going to have to go and try everything you can find.
Did you try the test I advised earlier? If your cabinets are out of polarity they will never sound good.
If you are going to go with a pair of 4x10s it's ALWAYS better to use matching cabinets. Disparate speakers often don't play nice with each other. BUT, that takes us back to paragraph three. If the cabinet is the problem two of the same will get you nowhere.
If you have any bass playing friends in your area maybe they'd let you play though their systems to give you some ideas.
What sort of gigs are you playing in the old country that need this kind of firepower?? I'm really curious. Back in my day a 4x12 and a 50W amp would do it all!
