Don't wanna burst your bubble Squeak, but 256 may not let you run very many tracks clean ( no pops or delays ), even in PT. You might get away with it though if you can disable some of the apps that Windows runs automatically at startup.
As for that Roland softsynth.. I have the equivalent that came with Sonar ( the VSC88 replacement... MP1 I think it's called ? ). I deleted it when I streamlined my Vst / Dxi selections, simply because I have enough that the ones I don't use get in the way.
I thought even my software XG module ( SXyG50 ) sounded better than the Roland module, and I can tell you that the xg module isn't as good as any of my Yamaha arrangers sonically, even going back to the PSR530. You might prefer the Roland though, as sound is subjective.
I have a soundfont ( it was a freeware ) based on the SC55. It sounds rather similar. Yours for the taking if you want it ( and I can dig it up.. I know I have it stored on a CD somewhere ).
AJ
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AJ