I've been using a Fram Ultra XG2 on my 5.7 Ram. Great filter. They are about $9 normally, which I think is a great deal for such a high quality filter.
Pepboys has 35% off right now when you buy online and pick up in store, plus Fram has a $2 MIR on them. I just paid $6.49 + tax from PepBoys for mine. Wait for the $2 MIR which might show up several weeks later, and when it is all said and done you are at $4.49 + tax! What a bargain!