Upgrading in stages

[Uzona]

I'll try to keep this as short as possible. My PC bites and I'm going to build a new one but due to limited budget I have to do it in stages. Finally convinced the misses to let me spend some money, but I gotta spend it before she does so waiting for something better or I have enough for all of it is not an option.

What I plan to salvage from current PC until I get a chance to upgrade it in stage III:

Monitor, Floppy, CDROM, mouse, keyboard.
MAXTOR 8GB 5400 ATA-66 (I think, but might even be ATA-33).
LINKSYS 10/100 NIC
USR 56K v.90 PCI modem


Stage I.
ANTEC SX1040 or Maybe the 1080.
MSI 845 ULTRA-ARU
P4 1.6a
256 MB Samsung PC2700
Win2K or WinXP Pro
Radeon 32MB DDR 4X AGP

(I know, I know, You don't like the video card. But it's $39 at newegg and my old Viper 4MB card won't work on the new config. It's only temporary and this is actually a big step up. lol. I'm also out of cash for stage I)

Stage II
Cable Internet comes to my area in June.(Woo Hoo!, no more 56K )
Cable Modem
Linksys Wireless Router
Wireless PCI Card so my son can share internet access thru the router.

STAGE III
August

2 40GB Maxtor ATA-133 Quiet Drive (RAID 0)
Lite-on CD-RW
Another 256 MB Samsung PC2700
DVD Drive

[B]Stage IV[/V]
Radeon 8500 AIW
or
Latest Card + TV Tuner

Now I know the HD, 256 MB Ram and Radeon 32 are going to be bottlenecks initially. But do you see any problems that will stop it from working?

My questions are:

1) Will my plan work?

2) Is the Samsung PC2700 Single Sided or Double Sided?

3) Ati's site says the Radeon 32 is 2X or 4X AGP and 3.3V or 1.5V.
A 3.3V card will damage the MSI board. Will I be safe? Will the card automatically operate at 1.5 when it see's the MSI supports 4X AGP?

4) With that Radeon can I use XP or should I stick with WIN2K? It doesn't look like there are drivers for XP. What drivers would you recommend?

5) If no conflicts with XP which OS would you recommend?

6) Anything else I should be concerned about? Incompatibilities etc.