Most enemy groups do at least some E/N/F/C damage, so resistance to those types is definately useful. However, REN and REL dont give too big a bonus, so i wouldnt pick them unless you dont have something useful to take.
I agree with Max. Those powers only give around 5% resistances 8%ish with 3 slots dmg res (wich is a huge waste). Theres alot better powers to spend your points in
Is it worth taking resist elements,energies? i mean do we ever come across anything that dishes out that kind of nastyness..
Mind you there isn't much else to choose from once you've taken all the major ones(rpd, ti, dull pain, unyielding, invincibility, tough hide, unstoppable) plus all the SS ones, except taunt,hurl, hand clap.
Any thoughts would be wellcome.