141 Instrument rating
I second de727ups about getting actual. The funny thing about flying in actual v. flying under the hood is that it's easier to fly in actual. Having the hood atop your head is a distraction in and of itself.
I instructed primarily in 141 schools, but all the people I knew were taking a complete 141 Commercial-Instrument course. I suspect you would have to attend the ground school as part of the 141 course.
Which may not be such a bad thing at all. You stand to learn more and receive more in-depth knowlege if you have to prepare for class, interact with your class and your instructor, study, and take tests. You learn more and you learn it better if you're forced to use all your senses and learn interactively. That is bolstered if you form a study group with your classmates and work together. You learn less if all you do is read the books, memorize the ASA book and/or watch the King tapes. Although I never used the King tapes, I took ground schools by the other methods mentioned above, and I learned more and enjoyed it more by going to class.
Good luck with your training.