No, Paul - the micro seems to be aimed at folks who want synthy sounds and vocoder options. I could never play those mini keys .... yuk.
Most of us that use arrangers, do so because we are trying to fill up the holes behind our solo playing. Given my "druthers" ... I'd be in a 10 piece horn/funk band playing bass and singing harmony, but the market for that kind of act is scarce.

Most high end arrangers are a kind of cross-breed workstation, having 16 track sequencers on board, large storage drives and/or usb connections. If you are the kind of player that sits alone in a room, (at home, or on stage) and wants to make as much music as possible with as few hands as we are blessed with, then arrangers can provide a means to sound like anything from a small combo to a large orchestra.
If you're more into creative manipulation of sound with envelopes, filters and such - then maybe a dedicated workstation will fill your needs. It seems almost a redundancy to own a workstation in today's world of high powered computers though. Having an arranger, coupled with the power of a PC close at hand will give you endless options.

The biggest advantage to some of the newer workstations are the editing power, and sometimes, sampling options...... but some arrangers even do that. The Korg PA80 has a sampler, the Yamaha 9000Pro does too. There may be more, but I own those 2, and I never use the sampling options. I leave that to the real pros. I never heard an end-user sample that I liked...... I'm sure they are out there, but I never heard one. Then again - I play the hits. I need staple sounds that reproduce the instruments in a band or orchestra. I rarely use weird or synthy sounds, because my target audience is usually dining or dancing in a more elegant setting. No raves for me at 48!

I remember you saying that you wanted a modular synth. Sounds like you are more of a tweaking fan. Do you like sliders and knobs more than rhythms and patterns?

Ask yourself a few questions:
What do you need the kb to DO for you?
Is it a production tool, or for performance?
Does it need to be portable?
Do on board speakers interest you?

There are many more relevant questions to consider when buying a high end keyboard, but since budget is almost always a concern, and I've seen you mention it before .... I suggest that you take Gary's advice, and go to the Maryland stores and make a day of it. take notes, write down specs and websites ..... and then come home and do some research on the web. We are so lucky to have all this info at out fingertips. Use it to your advantage.

Good luck, my friend.