Welcome! Are you one of the three winners last night (we may never hear from him again). The C10 is a 6-speed.
Some riders have changed the primary drive gear in the C10 trans to do what is called a "7th-gear" mod. SISF (Steve in sunny Florida) provides an exchange to do this. I think it is a 12% rpm drop so you don't keep trying to upshift when you are already in 6th gear. The engine of the C10 doesn't really come to life until you get over 4500rpm then up to about 7500rpm. Higher than that and there isn't much more. Maintenance is pretty straight forward. The bike has been around for years with very few OEM mods so parts are pretty cheap. There is also a huge knowledge base here to browse thru. Some non-mechanical riders have picked up an older model with too many things to "fix" and become easily frustrated and hated the bike. A "good" C10 can be had for about $1500 to $3000 depending where you live. "Low" mileage isn't the first factor to be looked at - current rideability is (how well does it run and idle). Then see what farkles (extras) it has, then how many miles. Your tire selection will greatly determine how comfortable you feel with handling or if you are looking more high-mileage. You can't really get both with the same tires. Watch out at parking lot speeds as she is very top-heavy and will take you down when you're not ready when new to the bike (and years later).