I'm gonna weigh in for OrganizedTrio, also - as a freebie (or donationee?) it's amazing. That said - if ya got a budget, B4 is definately tops. I carted around a Hammond for years, and B4 is so on it you can get splinters from the case!
Take note, tho - neither of the above are samples, they are real time emulators of the real thing. I've never seen (heard) a sampled B that cuts it for me - it's just too expressive an instrument to reduce to a single recording. I'd say the same for pedal steel - but I honestly haven't checked much out in that area lately.... If ya go for sampled B, I hope you have a foot-controllable tube preamp lying around - and a real leslie...