If you use foot pedals then I would probably think twice about the BX3. I think the cost is waaaaay too much for what you get. On the other hand, if you don't, and you have the money, fine. Spend away. Personally, if you want a portable, I recommend getting the CX3 for upper and lower manuals, and get the VOCE V5 for the bass pedals. A good controller to use for the upper manual is the Radium 61, which you can get on ebay reallllly cheap.
Check this one out:
Radium 61You'll need a speakeasy tube preamp, because the organ sounds just that much better going through it. The shotgun version costs just under $300.
Also, you'll need a small mixer to run both the V5 and CX3 into the preamp. Here's a list from ebay:
mixersAnd, finally, if you don't have one yet, you'll need a good amp. Everyone, that is everyone, recommends Barbetta. Personally, I built my own leslie, which sounds good to me. If you add all that up, you'll still be under the price of a BX3.