Actually, no, I haven't did anything to optimize my PC for recording. Frankly, I'm hoping that everything will just work the way it's supposed to. Yes, I realize that this is often an unrealistic hope, when it comes to computers. My plan is to hook up the Presonus this weekend and spend some time getting it to work. If I run into trouble, I'm sure I'll be doing searches on the Computers forum here, and asking questions. If I really get into a bind, I'll be sending the computer in to see my computer guy in another week or two, anyway, since I want to add a second internal hard drive and have some quieter fans installed.
Right now, I'm definitely leaning toward the Steinberg set. Mostly, I need a drum machine and a good piano patch. It sounds like the Edirol program includes some nice drum sounds, but doesn't have any rhythms to use with those sounds. I'll probably end up programming my own patterns anyway, but it would still be convenient to have a "computerized drummer" on hand when I just want to fool around with some riffs and chords and stuff. Second priority is to have a decent piano patch. From listening to the demo songs that vestast pointed me to, and to bleyrad's song, I think the Grand will be quite satisfactory. It definitely sounds like it'll be a huge step up in quality from what I've got now. So, the Steinberg collection is probably what I'll go with. Within the next month or so, I'll also be picking up a couple more LDC's (Shure KSM-27 & ADK A-51 Hamburg), an electric guitar (an SG), a couple of more expansion cards for the XP-50 (to add some better orchestral voices), and a RNC or two. So, combined with the mics and rack gear that I already own, I should then be pretty much set to start demoing songs.
You have all been very, very helpful. Once again, I want to say thank you very much for all your comments and suggestions.
Brad