D. - I go to Nail Attractions in Lewisville - on Main Street right by I-35 (in parking lot of 24 hour fitness). It's not a cushy spa or anything - it's a big room with about 16 mani/pedi chairs. You can walk in, no appointment necessary. They always have enough staff to cover. I've been very happy with my nails & pedis from there. They do eyebrow waxing too. They do a quick sterilization between customers in the foot baths, they toss used utensils into sterilization bins and get new ones in between. Of course, not being an inspector, couldn't tell ya if they're doing a good job, but from what I have witnessed, I am okay with it. (I was there very late one night and saw them bleach out each individual bath and also scrub it with Cascade.)
They just started something new where they serve free margaritas while you're getting everything done. (can choose alcohol or not) And occasionally they sell knock off designer purses and sunglasses. It's a one-stop shop! But like I said, it's not real spa-ish, but I like it.
The one negative is they do like to upsell - they give you price sheets when you first sit down and have you pick what you want and I've seen them pretend not to understand english in order to get you to go for a bigger package.
Good luck!
S.