The DI Spa is run by WDW. The GF Spa is leased to Niki Bryan Spa Management. Both set their own pricing schedules.
I haven't been to the DI Spa. I really like the GF Spa. The Spa Sampler and massage sound like heaven to me. If you don't want to spend quite as much, skip the massage. Your arms and lower legs/feet are massaged during the manicure/pedicure, plus they have you sit in a heated vibrating chair while they work on the nails, so it's like getting a mini-massage anyhow. In all honesty, between the facial and manicure/pedicure you're looking at well over three hours including time to change and let your nails fully dry. I always let my nails dry for a full half hour after TC gets done polishing them, so I plan on a minimum of two hours and fifteen minutes for a manicure/pedicure.
Do yourself a favor and ask for TC do do the nails. She's great!
Anne