As of right now, the only channels that are digital in the immediate Spartanburg area are USC-Upstate, GSP Airport Operations, and SRMC Emergency Preparedness folks. All Fire, EMS, and LE channels are analog at this time. It's unknown when that might chance, but I don't expect it to happen any time real soon.
However, several surrounding counties are mostly digital - Greenville and Laurens, most notably. If you expect to take your scanner on the road in SC, you'll definitely want a digital-capapble scanner. And as upgrades are made to the Palmetto 800 system over the next few years, most agencies using that system will be digital.
So, if you're looking to save money now you can get by just listening to most Spartanburg agencies with a non-digital scanner. If you want your investment in a radio to last more than a couple of years, go ahead and invest in a digital scanner.
Another thing to consider is programming software - do yourself a favor and invest in a computer-programmable scanner, cable and software. I believe a cable is included with most Uniden-made radios, but you have to purchase them separately for RS/GRE scanners. You'll have to purchase new software when you change radios, so factor that into your budget.
One other plug for RS/GRE scanners, I live in Spartanburg and have a pretty good collection of programming files for the Spartanburg area for these scanners that I'm happy to share. Contact me via email or PM for more information.
Brian