First question... why not install SP4? it's probably the most stable SP build for 2K they've come out with.
IMO, I've used all three, True Image is the easiest to use, does a solid job and compresses pretty fast if you're using that function.
Norton 2002 will back up NTFS partitions, it just does it in a screwy manner. The issue is when it comes to restoring them. You can do it, just have to do a bit of research. Since you have 2003, this isn't an issue.
Drive Image 7.0 requires .Net 1.1, not sure if there are any issues with it and SP3.
For regular backups if you're going from HD to HD, just use the backup functionality that's built into Win2K.
FYI any time you do use any kind of compression with backups, you do increase the probability that errors will occur.
The kicker for all of these products is the introduction of support for RAID arrays that are using the Intel ICH5R Southbridge, at the moment there isn't any support.
P4 2.6C, Thermalright SP94/Panaflo 92MM M1A, IC7 Max3, Swifty MCX159, 1GB Geil PC4000 Ultra Plat, Radeon 8500, Audigy 2, 2X WD Raptor RAID 0, WD 250GB SE, Plex 708A, 166SDVD, LianLi PC75, XP Pro.