thats a very good point...being able to move the SS on and off the platform is a definite plus. i had to move my rack in to the garage because it took up too much room in the gym. it still put to use every now and then, but the SS more than suffices for the basics.
as for the pull-up bar, you can easily make one for a fraction of the cost. galve pipes with flanges screwed into beams, jungle gym types, etc. but that also depends on your situation...ie are you able to 'customize' your home? nonetheless, pull-up bars are easy to get creative with. another option is something like this:
it makes pull-ups fun and interesting. and its very easy to install. this or their more economical products are worth it.