Please Help, Recording set-up Options

[Kurz1]

I have a Kurzweil K2500x, a Mackie 1202 Mixer, Yamaha Power Amp and Alesis Monitor 2's. Now I need a computer for audio recording. 95% of the time everything will be done on the Kurzweil. In the future I might want to add a vocal, or guitar, or flute. My stuff is (for lack of a better term) New Age. Yanni, George Winston type stuff. Almost all instrumental. I can afford a G5 or a G4 1.25 dual and whatever interfaces or software I need (except full blown pro tools). I don't want to "over-buy". My computer will only be used for music. I want software that is not going to take me forever to figure out how to use. I have been looking at midi interfaces, soundcards, etc. trying to make sense out of all of it. I am electronically illiterate. I would sure appreciate what people would recommend. Thanks in advance for taking the time to answer my question.

Kyle

[lync4495]

Question regarding the Motu 828 mk-II. That interface does have a MIDI in and out port so while the audio desk software doesn't have any midi capabilities if I was running say Logic I could use that to get the midi into Logic. Now, if I have a single keyboard controller and use software synths, this interface will be enough for my needs right? I haven't done much with midi and it's pretty confusing to me, but say I'll only have one external midi device - am I right in thinking that I'll be able to route that device to at most 16 different internal software synths (one on each channel)?
If I only have one piece of midi hardware, a separate midi interface wouldn't be necessary - right?
Thank you...
this site and the people who frequent it have been more than helpful to me ...
thanks