You need an amp that rocks, two 12's are good very good but thats a loud amp too, unless you do two green backs at 30watts each and a master volume amp ...this all seems to be saying JCM800, something with a master volume though. For blues I have a real sweet spot for a Fender 5E7, but the JCM can do both.
This type of amp kit would have three preamp tubes and two EL34 power tubes, its a kit that may be hard to do for a first time out and its a 50watter, but with a master you should be ok. Here is something you could build or buy if you wanted a project:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewI...;Category=10171