I don't think you'll be able to run Leopard on this machine, so that it'll be fun. SSE2 only is not the problem, but mainly the ULi chipset and that it's an AGP board. I am interested myself if Leopard supports AGP 'cause I have myself a SSE2/AGP machine (using it actually).

Nevertheless: I would recommend a single HD for using MacOS X cause it uses a different file systems and there could be some problems using a combined HD. Dual booting is also easier to realize with two harddisks. Use an IDE HD, it's the safest way. But again, I'm not sure if ULi is supported.

To the Windows installation: it asks every time at the installation for a possible needed driver disk. Normally it is only neccessary if you have an 3rd-party controller which is not integrated in the chipset, like an PCI SCSI controller or onboard RAID controllers. I have on my boards a SiliconImage SiI3114 Raid controller. If I wouldn't give Windows the driver disk at the beginning I would not be able to boot from this controller. But I can boot from the standard IDE and SATA controllers which are part of the nForce chipset. If you really needed a driver disk to detect the SATA HD you can skip installing OS X on that drive. Have you ever tried to install Windows without a driver disk?

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2 Opteron systems: OSx86 10.5.8, Andy's 9.8.0 kernel, Asus A8N-SLI Premium, Opteron 185 o'clocked @ 2 x 2,95 GHz (2nd system 2.6 GHz), ATI Radeon HD2600XT 256MB Dual-Monitor 2x HP L2035, 4 GB RAM, Griffin FireWave as main audio device, Marvell + nForce LAN, Asus U3S6 USB3/SATA6 card, 5,5 TB harddisk, Firewire 800 card, Apple Remote + eHome IR receiver, 2x Wacom serial graphics tablet, Canon Pixma iP4700, Logitech Internet Navigator wireless keyboard/mouse combination.

My Audio stuff: M-Audio Transit USB (default audio), M-Audio ProFire 610, M-Audio ProFire Lightbridge (34 channels) using Creamware A16 ADAT converter • MIDI: M-Audio Midiman 4x MIDI interface • Behringer Audio Mixers: Xenyx 1002, Xenyx 1002FX, Xenyx 1202FX, Eurorack UB1002FX, Eurorack MX1804FX, Eurorack MX262A • FX devices: Lexicon MPX100 DSP, Behringer DSP-1000 Virtualizer, Behringer MiniFEX 800 DSP, Behringer Multicom Pro MDX4400 compressor • RETRO: MSSIAH midi/sequencer/synthesizer cardridge for the C64 (Dual-SID), Steinberg M.S.I. MIDI Interface for C64