Family Medicine - Sloane; Swanson's for questions
OB/GYN - Blueprints + Pre-test (you may see a pattern)
Medicine - Get the review book of your choice (they are all pretty much the same) and Pre-test
Psych - Blueprints + Pre-test
Peds - Blueprints + Pre-test
Surgery - Recall + Pre-test
Pre-test is a PHENOMINAL resource for almost all core electives (you can find them cheap on half.com and amazon.com under used books). Also, if you do not want to buy texts, don't. The internet has become an invaluable resource (sources like emedicine.com are great).
Good luck.