Can't tell you about your ScanMaker or anything relative to SilverFast, but I find it easier to get a scan that accurately represents the print by scanning the (wait for it...) print. Most modern scanners can scan a reflective original with all settings on automatic and give a good scan, a little tweaking of levels to get the overall brightness right and it's ready to resize and upload. Scanning a B&W negative carries a relatively steep learning curve (I'm still learning better ways to do it, and I've been scanning my negatives for about 2.5 years).
Also, if you need to do any dodging or burning, I find those a lot easier to get right on the print, once, and then scan the print, rather than fight with Photoshop or GIMP to get the same appearance in a negative scan. Just my opinion, of course, but a few months ago I pulled all the negative scans out of my APUG portfolio, leaving only print scans...