I did the same thing last year, still got my DAS6 DA as its useful on soft paint, applying pre-wax cleansers etc etc.
The rotary is totally different but is much quicker for correction etc, with a bit of practice you will be fine, they are not scary paint burning machines as some make out.
I went for a Makita (£200) which is about the same weight as the silverline but better mechanicals, great machine but heavy on the vertical panels so have sold it (on DW) and bought the Chicago Pneumatic from Autobrite for £188.
CP is a cracking machine.
Biggest problem you will have with a rotary is finishing down, initially you may want to use your DA for refning after correction to remove any holograms left during the correction stage(s).
Hope this helps.