Just wait till the official Dets 50s are out and they are modified for quality as it is the case with the StarStorm Detonators
Then Nvidia will have the speed and the IQ to handle those maps.
I'm using the StarStorm Dets 45.23
You can check the quality here. performance wise is not much different than the official detonators at all for UT 2003. However DM-Icetomb does run like crap for me since it is based on Dets 45.23.
Quility wise is well you can see the difference. Much sharper images. awesome AF.
Check these shots for quality.