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I've been out of the loop since the Priests expansion (although I did get a box set of the early church). It's easy to spot "good" cards in later expansions mostly with the R or UL notation. "Good" lost souls are harder to spot. Are there a few that are considered "must haves"? If so, what expansions are they in? I'm in the market for some booster packs, and aside from targeting obvious cards (shipwreck, false prophet etc), I'd like to get some powerful LSs as well. Thanks for any input.

I think the Lost Soul (awake) from the Persecuted church card set (the newest card set) is a really good one.

It is a Rare card from that set.

Lost Soul (Awake) 
If you draw this card (except by your special ability) , you may search a deck or discard pile for a Lost Soul and put it in play.

I really like the FTBN lost soul from the Disciples set. It simply negates all other lost souls. It stops cards such as the hopper lost soul and the above mentioned awake lost soul. I don't know how many people use it, but I find its often the one that people target, so it seems to be doing something they don't like, which is good for me.