I really like iColor. I have been multiple times now, after first going there with a Groupon. The prices are reasonable and the staff is friendly and good at their job. I even WON a free pedicure from liking their facebook page. They now even have a reward program for clients as well.
Lots of gel and non gel color to choose from and great for groups. Walkins welcome, I'd recommend an appointment for two or more people.
Can't wait to go back!