Which would you recommend for learning tunes and basic praticing while on vacation? I dont want to lug a full size board with me and I dont want to not touch a board for a month. I would like something small with decent sound just to keep up with stuff.

Any advice/suggestions?

Sorta sounds to me the MicroArranger is the way to go for you.

Nigel - were you suggesting the MA because of the built in speakers? I have not actually seen the MA in person, but on line it looks a bit heftier/bulkier than the MS. Are the sounds the same? Which Korg full size arranger spawned the MA = the PA50 or something more recent?

The MicroArranger has the same operating system and voicing as the PA50SD.

Thanks to all. Just a little note - while I do play a arranger keyboard, I am a minimalist. My own LH bass and RH chords/melody. Most middle of the road arrangers DONT really do that with full arranger accompaniment. You can have JUST drums. Korg arrangers have always allowed you to assign the arranger to the right or left hands (or across the board, of course). Does the micro have that functionality? For what it's worth, I use my arranger board (a trusty Technics KN2000!) as my main keyboard with a band and don't often use the arranger functions at all. So I do not necessarily NEED an arranger...