I have the s200 and often wondered about upgrading the sedra to a bubble blaster pump. I also thought of uprading to the sedra ho pump. I dont know if the fittings would match up.
I may just get a new skimmer.
Sedra's have had impeller swelling issues for years. I was sad to see that hasn't changed, so I wouldn't go with another one if I had to choose, ho or otherwise. The skimmer itself is built quite well, IMO, so I'd like to keep that part :)