Best thing you can do is run a search on the board of a particular school. You're sure to get back tons of feedback.
I will tell you about FlightSafety Academy in Vero Beach, Florida,
http://www.flightsafetyacademy.com . I was an instructor there ten years ago. FSI is a large commercial flight school, well-known in the industry. FlightSafety International operates the school. FSI is a major flight training organization. The Academy offers a Commercial pilot course with multi-engine and instrument ratings that can be completed in six months. Quality of training is excellent, and there are employment opportunities as an instructor after graduation (the instructor course(s) is extra and is not included in the CMEI course). The school operates Piper Cadets (Warriors), Arrows and Seminoles. Good aircraft and good maintenance. Good facilities. Mostly a professional atmosphere.
FSI is recognized in the business. As with all flight schools, you have to consider its advertising with a grain of salt, but the place isn't blowing smoke about its claims of sending grads on to the regionals. The school trains self-funded students from all over the world. It is also known for its foreign airline contract training.
Cost at FSI is not cheap, by any means.
One other place to look at is Mesa Airlines Pilot Development in Farmington, New Mexico,
www.flightcareers.com . I worked there, too, in 1993. This school is operated by Mesa Airlines. It offers a Commercial- Multi-Instrument course. You also attend San Juan College and earn an Associates in Aviation. Students graduate with 300 hours with 10 hours of turbine in Beech 1900 airliners. Graduates who walk the line get interviews with Mesa Airlines and can be hired to fly for them. This program works, but, beware, no interview or job promises are made at enrollment. You have to earn both. You are scrutinized very closely during your training, and any miscue will scrub your chance for "the interview." MAPD isn't cheap, either, but does get people hired at a regional at very low time.
Hope that gets you started. Good luck with your school search.