My first choice would be BS and JC. BS can make mucho bank off of crafted epics, and also item enhancements such as belt buckles, shield spikes etc. JC made me many many thousands off the Saronite shuffle, and I am keeping my eye open for the Cata equivalent. There is also the ability with JC to buy raw gems off the AH and easily value add to them. Everyone needs gems, almost everyone has bought gems off the ah at one time or another.

If you like camping the ah, managing inventory and spending large amounts of time at the mailbox, then pick inscription and bs/jc. I really can't see any potential to make consistant gold off glyphs in the future on my medium pop server, however I will be making darkmoon cards (a huge earner for me in WOTLK) and off-hands.