I currently am a tech at Prisma and I love it. I've worked at other hospitals in the area and this is the best in my opinion. Prisma is also in the process of bumping up pay scales to be more in line with national averages (and to compete with local hospitals as well). I've heard that starting RN pay is between $27-$30, but I don't know if that is accurate.
Downtown is more pricey when it comes to apartments so I would suggest looking at Powdersville or Simpsonville for better prices. Woodruff Rd has some good prices and nice complexes, but it absolutely is THE WORST traffic in the upstate. The word nightmare doesn't even come close to describing Woodruff Rd traffic. Taylors is also a nice area that is mostly subdivisions and family-oriented stuff, but it is maybe 10 minutes from downtown and all the nightlife. A lot of people I work with live in Mauldin and enjoy it there.
I really like our location, it's around 2ish hours to both Charlotte and Atlanta and around 4 hours to the beach with a slightly better cost of living.