http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=4713&item=3743526226&rd=1 The above is for your consideration. I am an expert on little. However, I have learned an important lesson in life. Never rush into something that is important. Check things out thoroughly, get it clear in your head just what you want, and then make a move when the time and circumstances are right.
eBay gets more Alembic lefties than many would think. I check there several times a day. There are not new ones posted daily, but they are not that unusual of an item there, and it is best to seriously learn about Alembics before buying one - unless you stumble across a great deal and know it.
In your post you mentioned just a few factors that consider value on the Orion you are pondering. What woods are the bass made of (This can have a great impact on its value), just which pickups and electronics it has, does it have purple heart laminates in the neck? Does it have inlays in the fretboard? Does it have LEDs in the neck? Best bet is to get its serial number and request a build list of the bass on here. Then more people can give you their opinions and you can look through the Orions in the showroom section and other basses there, too. Maybe you will see a Epic or a Mark King that you feel you want much more than the Orion.
At $2,000 for that bass, I doubt you need to rush on it. Bottom line - You decide what you want and then make a move. Grab a digital camera and post its picture here. Then you will get a lot more opinions and better advice.
Whatever you decide to do, I hope it all works out for you. There is nothing like owning your first Alembic, except for topics best left to other sites . . . BTW - Welcome Lawrence. I am sure you will get some good advice from members and staff, and everyone on here is very helpful. Take care.