And I'm back.

Update:
1. After numerous experiments with getting linux, vista and xp on different drives and partitions and what not, I have finally managed to get XP on, let's call it, SATA-1, Vista on IDE-1.
2. I have to get OSX (iPC) on SATA 2 now. Also, Ubuntu Studio needs to go on either SATA-2 or IDE-1 (whichever's easier).

So my questions now are:
1. Do I install OSX first or Linux first? I am going to keep Vista's bootloader. I have EasyBCD 2.0 Beta on there so I will be booting into that after every install to reset it's bootloader.
2. While installing Ubuntu, I need to install grub only on its own partition but i don't know which device to type in. Is there any way I can find out wheter thats sda/sdb or whatever that partition is going to be?

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Desktop:
AMD Athlon 64 3000+
MSI RS482M2 Motherboard
2GB DDR400 RAM
1x 80 GB IDE HDD
2x 120GB SATA HDDs
Creative Audigy Sound Card
GeForce 8500GT PCI-e Card

Laptop:
CPU
AMD Turion 64 X2 Mobile TL-50 (Socket S1 638), Codename: Taylor,
Cores: 2, Instructions: MMX, 3DNow, SSE, SSE2, SSE3, x86-64
Motherboard
Quanta 30B7
Chipset: Nvidia GeForce 6150
Southbridge: Nvidia nForce 410/430 MCP
Memory
4GB Dual Channel DDR2 RAM
Sound
Conexant HD Audio