Thanks everyone.
I have the multi-booting Windows environment questions answered above, as well as from MS:
http://windowshelp.microsoft.com/Win...749fe1033.mspx Have attempted to use Antec online power calculator but am not 100% certain I've inputted the criteria correctly but I think I should be fine. I might just downgrade to a 4 HD rig to be sure.
I guess nobody could tell me if my PSU would be wanting as I didn't list all of my components and peripherals (see I TOLD you computers aren't my passion)
My current pc with XP installed has:
Antec P180 aluminum mid-tower case
Intel D975XBX2 motherboard
Intel Core2 Duo E6600
3 Hard Drives:
2 x WD Caviar 320GB (data)
1 x WD Raptor 36GB (for XP/apps)
Antec TRUEPOWER TRIO 550W power supply
BFG e-GeForce 7600GT nVidia GeForce 256 MB PCI-E
4 x 1.0 gb OCZ 800 RAM
1 LG GSA-H22N DVD RW 18x
Microsoft Basic Keyboard & Microsoft Wheel Mouse Optical Black
Zalman NPS-9500-Cu-LED CPU cooler
Vantec Stealth 120 mm fan
1 TB WD external drive with separate power supply for backup (plugged in ONLY whenever I download new photo files that need backing up)
Use wireless USB antennae
Use USB receiver for wireless mouse and keyboard
I might just go with a 4 HD drive set up. Really the only reason I was to go with a 5 HD rig was because I would have 5 HDs after buying a new Raptor and WD 1 TB drive. I was just going to keep the 2 older WD 320 GB drives around for scratch disk and Windows file paging ONLY because I have them. But if it is a luxury that could fry the PSU, then it will be wise to leave them out - perhaps as yet additional backup storage.