Emu XL-7 & MP-7 User's Group

Hi all, I currently have an XL-7 with three Roms, the X-Lead (expanded one??), a Composer Rom, and a Beat Garden Rom. 

I'm trying to decide what to put into the fourth slot. I make deep, experimental, minimal, techno etc and the obvious choice would be Techno Synth Construction yard, but I'm not sure what sounds it would give me over what I have already. 
I am already satisfied with kicks, bases, hi-hats, sub bases, snares, electro sounding pianos etc. The Xlead rom is choking full of synth sounds, but a lot of them are not useable for what I do. I just think I'm lacking some quirky sounds, glitchy, metallic sounds and also warm fuzzy synth stuff. 

I'm wandering about the Ensoniq Halo or the ZR-76 roms. Anyone have these and care to comment on their sounds, it would be much appreciated.

P.S. The Composer is very underated in my opinion. I've seen them selling for $50 on ebay, so if you don't have one and have a spare slot, get it! You really need a good midi keyboard to unleash it's potential.

Command Station group on Soundlcoud: http://soundcloud.com/groups/e-mu-command-station