Wow... the Joule Electra monoblocks should be a big step up from your Belles amp!
I'm in a similar situation as you in that I too own a Joule Electra LA 150 preamp, but my amp (BAT VK 200) is not on the same level as my preamp. Let me know how the new Joule Electra amps work out for you, and if it was worth the investment.