Eden and Mesa
The head is a late '90s WT-500 atop a 410XLT 8 ohm. I purchased the amp from Scott Ambush and couldn't be happier with the tone. When bridged mono, the amp puts out 600 watts into 8 ohms and you must be at 8 ohms. That combination has brutal low end, very focused tight and deep. IMHO, ideal for slap... right up your alley Chris.
The mesa rig is an mPulse 600 atop a PowerHouse 212. The tone is very tastey and compliments the tone of a J. The low end is a little weak (less tight and focused), when compared to the eden, but it more then makes up for it with character and a nice mid-range growl. I use it primarily for my rock and blues gigs.
Chris, you are more then welcome to borrow it anytime. Just let me know when and where you're playing and I'll even deliver it! You can repay me with a lesson or 2