I'm assuming you're using the 18ga stuff, right? If so I have some 5/16" NMF that might be big enough to fit the mess inside. Just let me know how much you need if you want to try and pretty it up. I have a spool...
I'm not joking, no dibs, no "calling it", nothing. In the unlikely event that I were to decide to part with it some day I deal with that then. It would be horrifically expensive compared to the Menace, that's all I know at this point.
It help a little more to know what about the 900s that you liked, what you didn't like, what sort of equipment you'll be using them with, what sort of music you like, etc, etc, etc.
You've given us so little to work with that you're not going to get much in the way of help.
Bought a few tubes for the MenaceTC.
Translation - 17 307A's, 10 KenRad, 7 Sylvania, average price of $9/each. Not all are guaranteed to work but crikey, at that price I just don't care. All I really wanted was one pair for testing (I have 3 NOS sets) and buying in bulk turned out to be cheaper than a single pair. Given DanC's love of the AD1 maybe I'll smash a couple 307As, just cause I can?
I can get you a couple bucks off anything Neotech (just about) and I wouldn't bother with anything heavy awg for this, isn't the power just for the bias? If you want to try 3x 18ga of the Neotech stuff I have some.