You're probably better splitting the CTP and the actual ATP. Currently there are only 7 schools where you can complete the CTP as an individual.
http://www.faa.gov/pilots/training/a..._Providers.pdf
Three of those programs are connected with 141 schools which train in light aircraft and three are 142 schools which issue type ratings. Higher Power/ATP Flight School does both. As a current jet pilot you'll find the CTP insanely boring, almost to the point of being insulting. There's 8 hours of aerodynamics which can be summed up "If you're stalling push the nose down." We now have 7 hours and 59 minutes to fill.
I know some of the CTP courses include links to online training for the written test. As almost nothing covered during the CTP relates to the actual written test I would say you should try to find one that includes that training so you're not having to buy that additional program on your own.