I have a Digisuite LE system with SR 4.5 and love it. If you're interested in system specs, I'm running it on a... Dual Pentium II 400mhz cpus Intel motherboard Adaptec 2940 (I think that's the correct #) U2W SCSI card 9 gig Seagate Barracuda system drive 18 gig 'cuda audio and animation drive 54 gigs of video space (6 9-gig 'cudas arranged in two drive stripes) CD read/write drive (external scsi) Sony DRV 1000 mini dv/dvcam drive Sony UVW 1800 Beta SP deck JVC SVHS vcr (for dubs down to s/vhs)(posted 9294 days ago)All in all, a great system. Remember, if you want to get the full benefit of the LE, don't skimp on the drives and scsi control card. Drive stripes of three, with the Seagate Barracuda LVE drives, and a good SCSI card lets me pull off 15mb a sec transfer rates, ending up with a virtually lossless image (1.5 or less:1).
When you consider plug-ins, I strongly suggest you consider Film FX2-- not just for film look, but for great color tinkering and ntsc color checking. You should also check out the SR mailing list hosted by http://www.pigsfly.com.
As for NTSC & PAL, I know they have SR versions for both, but I don't know about how to handle both (aside from conversion options outside of the core NLE system). I'm sure the folks at in-sync could clear up the options.
Good luck, -- John