Subject: Pulsar is awesome, LunaII is cheap!
DSP Factory is great for mixing, but is pretty much limited to just that. The routing is no where near as flexible as Pulsar/SCOPE/Creamware products (nobody comes close), but if you don't need this flexibility, then this card may suit you. It has good sounding dynamics (better than stock creamware, but not amazing), but the card is fixed in functionality.
Luna II is like a miniPulsar. You can load Pulsar devices, and you get the nice ULLI. This is a great way to get your feet wet in the world of Pulsar/SCOPE DSP technology. It's rather cheap, with street price around $349. The I/O is 1/4" stereo In/Out, SPDIF In/Out, and Midi In/Out. It also has a ZLINK connector for the Creamware Firewire Luna breakout box.
You can add ADAT ports for another $199 for more I/O options.
Pulsar II would be really awesome, but is quite a bit more expensive. You get just about the perfect number of DSP chips (I think 7 or 8 is plenty to do anything pretty much), again the ULLI, but it comes stock with ADAT ports as well. You also get a lot more devices "out of the box."
Luna II is probably the best bang-for-buck out of these 3 cards, pretty much nothing touches it. However, you'll probably end up wanting more DSP if you like it
Also, remember to read the FAQ over at creamware's site for computer hardware suggestions.