For me it is the Mesa Boogie 400+ with their 410 cabinet. What a warm, full sound amp with tons of low end, power, and great looks. People like Paul McCartney and Duck Dunn were 400+ users. The Eq with the foot switch was an added bonus for more flexibility. It offered to me one of the best bass amp sounds I ever heard. However the 98 pound cabinet was too heavy and size was too deep to easily fit in my car. The other issue was one of the tubes would go bad or micro phonic. Then I had to figure out which was the bad one and I had to replace the tube with a matched one from Mesa. They did offer a coupon on retubing the unit which was nice the first time I did it. Now with having a much lighter Tone Hammer 500, I would not mind owning the 400+ again for just playing at home. I would stay with the Tone Hammer 500 for playing out as its soo much easier on the back. But for less headaches in many ways the Aguilar DB 751 may a better choice if i want a little smoother sound.