On a scale of 1 (worst) to 10 (best)...Antique Sound Labs OTL32 - (6) "OK", but not so great. I always thought something was lacking when I owned one, even with NOS tubes. A recent re-listen to a (more expensive) modded version gave same impression. Definitely needs the upgraded tubes (which ups the total cost). It's better with standard headphones, imo.
Chazz KT88 - (3*) Six Moons rated the Chazz far below the OTL32 in their reviews. Just didn't have the juice, despite the specs, even with the KT88's. *I haven't heard this amp personally.
nOrh se9 - (7.5) Pretty nice, especially after tubes are upgraded (added cost). Still not completely satisfying, nor bringing out all the K1000's are capable of, but decent.
Dared 300b monoblocks - (9) Despite their initial low entry price (w/o tubes), unfortunately these cannot be considered "budget" when the cost of the requisite tubes are added in. Built-in attenuators make a preamp not necessary (saves on total). Plug in a pair of WE 300b tubes and enjoy the sound.
SAC K1000 amp - (?) Dunno, never heard it.
Just my take on these oft-mentioned contenders.
A better source will go a long way toward a more satisfying experience with the K1000's. That's where I'd put my money first, even if your amp is a T-amp (or any current, low-priced digital amp/receiver). After that, I think a quality solid-state power amp that is on the warm side, paired with a tube pre is a good way to go with the AKG's.