Try ...
... to get a used dedicated film scanner. They offer much more quality than any flatbed scanner could possibly deliver for 35mm negative/slide scans. I could recommend Minolta Dimage Scan Dual II, II or IV. They are cheaper than similar Nikon Collscans, but on parity in terms of output quality. They can scan four slides or six pieces negative stripes at once. A killer feature is an aditional APS adapter, by using which you can import the whole roll in one session.
I myself use the Scan Dual II via USB 1 interface. It´s fast enough for me. I got it for US$ 130 one year ago via eBay. You don´t have the hardware scratch removal more expensive models give you, but you get very good quality scans in roughly 11 Megapixels (4032x2688). I do archive family history on negative and slide. I use 16Bit output at the highest resolution, which is important, if you plan to photoshop them at some point of time.
If you archive old material, it is recommended to not use any manipulation on the scanned data beforehand anyways. Just digitally enhance them, when you need to do so. That´s my practice at least for now. Until I can afford a digital SLR going beyond 11 Megapixel including optics myself, I am going to stick with my analog stuff.
