The AEG 150mm random orbit can be got for a smidge over your budget if you shop around – made in the same factory with the same internals as the ones by Metabo and Maffel. But cheaper in the UK as AEG doesn’t have much of a following here
Good robust unit, has a round dust port – as DD recommends – although still a bit of a fanny about with bits of old tube and gaffa tape to get a hoover to fit, but at least it can be done.
But the best bit is all 3 of those machines have a switchable orbit – from 3mm to 6mm (6mm is a bigger orbit than you’ll get from pretty much anyone else) which means you can swap between finer sanding and removing larger amounts of material – I use one as much as a carving tool for big polystyrene and polyurethane sculptures as much as finishing tool and for that the extraction is ideal – otherwise it looks like christmas all year round.