by the way i've looked into it a little further and the twinmos you got as you are aware now is a hit and miss kinda thing. the best you are going to get are the utt 50 ns chips.
These are supposed to be utt 4.4ns chips //www.newegg.com/app/ViewProductDesc.asp?description=20-218-405&depa=1
Everyone should be aware of the fact that these require high voltages to max out and there have been people who have fried these. The pcb's may not be designed to handle it. I believe the mushkin are bp pcb's which can take a little more juice.
These are supposed to be utt 4.4ns chips //www.newegg.com/app/ViewProductDesc.asp?description=20-218-405&depa=1
Everyone should be aware of the fact that these require high voltages to max out and there have been people who have fried these. The pcb's may not be designed to handle it. I believe the mushkin are bp pcb's which can take a little more juice.