I am assuming you want an 88 Key 'Arranger' for practicing at home.  There are some out there.  One in particular is the Korg SP-500.  I have played it personally and it sounds very good although I am not "up" on all of its features.  If you don't mind a non-Arranger for your home Studio I think the Motif ES 8 would fit the bill to a tee and then some.  It has the best Grand Piano sound I have ever heard on a Synth.  Plus they have included Chord Recognition into the feature list.  And it has a digital I/O for added sound enrichment.  If you have an AC-3 capable receiver, ie., "Dolby Digital", your output sound will be even better.
I have only one Keyboard at the moment.  My PSR 2000 has never failed me yet in a Live situation but I realize that I am taking a chance without a backup.  If and when I get my next Arranger Keyboard, I will most likely keep the PSR 2000 as a backup.  If I get the new Motif ES in addition to the other 2, I would have 3 Keyboards standing ready at my beckon call when needed.  

I am patient though, (at least I think I am  

) in trying to wait for the best options/price point/features etc. before I make my next purchase[s].  Money is another factor too.  

Best regards,
Mike
PS: If you've got the dough, I think as long as you have the room in your house/studio/etc., a couple dozen Keyboards doesn't sound too extreme to me.  
