Matthew, I can not help with any comparison with the DT 880, but the MB Quart does IMHO complete with my HD650 and AGK 701's, they do not have the bass of the 650's but do have better clarity or detail than the 650 or 701. Yes, I also believe that the money would be better spent towards the speedball, nos tube, and 100uf film caps. The MB Quart's are exceptional with my highly modified Crack (speedball, nos tubes, 100uf caps, choke, 50uf film cap in power supply, and extra filament xmr for 6.5 amps to run 6336 and 6528 tubes). The Speedball is a must in my opinion.