I got my one touch at Lowes on sales for $75.00 which is a 22.5. This included the Rotissierie kit and a grill grate kit. They normally sell the this unit for $149.00. Normally, I also get my 10 per cent military discount at Lowes including everything on sale or not. So, I would say that is a very good price.
After I purchase something, I always seem to have buyers remorse and wonder if I should have purchased the bigger model. Always, count on the fact that you will be buying attachments for this unit to make it do something that you cannot do today. In that case the 22.5 has more aftermarket attachments for it made either by Weber or vendors who make their living by selling add ons for the Weber like Kettlepizza, Smoke EZ, or Cajun Bandit. Keep this in mind as you go forward. And, these attachments are not inexpensive.
Ed