Hi sen23,

The only other one I can think of is the Kurzweil K-series. However, they are more expensive (even the K2500) so you may not be interested. There is the K2000 but it has limited polyphony (only 24 note) which is extremely limited in today's day and age. The K2500 and K2600 offer 48 note polyphony at least.

The sequencer seems to be quite good and their synthesis is also quite good (VAST). I agree with stigf though that the Rolands may be better for you if it is your only sequencer. Also, go by what kinds of sounds you need from this workstation keyboard. The Triton is more geared towards synth sounds while the Rolands have more bread & butter sounds (better pianos).

Oh well, hope this helps.
Fernando