It all depends on your needs really. People tend to use high end hardware and based on that, I would swap 9250 for something faster in the first setup. Also, I would use Live! instead of SB128 in the second setup. Third setup seems to be balanced, although in terms of period-correctness, something like AWE64 would be more adequate. Last setup should be very compatible with various DOS games, although with SoundBlaster Pro you are limiting yourself to 8-bit/22kHz audio.

Please share some more details about intended use-cases and specific parts. "Pentium 4" is very generic and it may be slow Willamete CPU as well as fast Prescott which can more than double the performance of the former.