Hard Drive Configuration, How should I set up 2 Hard Drives? Options

[Lotus17]

I plan on buying one of the new Seagate NL35 hard drives for my PowerMac G5. The model I want is a 250GB, SATA, 16MB Cache. Here are a few questions.

1) Which hard drive should I make my main hard drive? The 160GB stock or the 250GB Seagate.

2) I should load my programs, samples, and other instruments onto my main hard drive, and use the second hard drive as purely recording space?

3) Is it okay to put other files on my recording drive? I have an extensive music library and was curious which drive would be best to put that library on.

4) My last question pertains to my current external hard drive. I have an external enclosure with the Oxford 922 chip via FW800. The drive itself is a Seagate 160GB, ATA100, 8MB Cache drive. Whenever I run Logic and start recording, there is up to a 5 second delay from when I click the record button to when the program recognizes that it is going to record. It is a little tedious but records flawlessly after that little delay. What could be some problems that I should look into? Thanks!