If you aren't exactly thrilled with Norton Systemworks, then I recommend Iolo's System Mechanic.
It lacks a Norton Disk Doctor-like application, but if you have XP, XP's own disk checker, combined with NTFS's native robustness compared with FAT32, will be just fine.
Otherwise, it has everything you'd want in a good suite: antivirus, antispyware, disk wipers, defragmenters, a firewall (for the pro version), and about 50 small utilities that you could probably get freeware equivalents of, but here they all live in one standard interface and update scheme.
I reviewed two versions of it over two years for CPU Magazine, and it has evolved nicely, and isn't coming from a company that is trying to screw you into buying new products every 6 months.
Hope this helps,
Warr