Just get the Bosch 1250DEVS 6" dual mode sander. Just as good as Rotex and dust collection is just as good as well.
Well it's noticably heavier, alot bulkier, works slower. Haven't tested dust collection so couldn't comment but seeing as the Bosch you mentioned is like an 8 year old design I kinda doubt the dust collection is up there with a rotex :/ would need to check it but would really surprise me :x