Depends on how old... The FRCPs were changed in December 2007, but a lot of the amendments deal with electronic media, so older ones shouldn't have that much, if any, effect on you. I used older versions (early 2000s) and got an A in the class. My prof recommended Glannon's E&E, though, and I did get the newest version of it.
As for other supplements, I used used ones and saved some $. For civ pro, and really for any of your classes, a lot will depend on how your prof teaches. I've had profs that followed commercial outlines almost to the T, and others who supplements were useless for.
There's plenty of threads on this, but I liked Crunchtime by Emanuel a lot. It was short and sweet and I wish they had it for ALL classes. Supplements keyed to your casebooks are also helpful (for example, Dukeminier is worshipped when it comes to property law). With the exception of Crunchtime, I used a different brand of supplement for every class. It is all about what works for you.