if you want an absolutely awesome pve duo, i would go with valewalker and druid (yes i love valewalkers) but with NF there are several bonuses: apart from BG on healers casters ad ability to assist casters using lifetaps (fully buffed i hit for 300-400, but ofcourse its just there to suplement dmg), you also get a UBER sidechain, combined with 8 sec stun on back chain is just crazy, i ht 500 a hit not including procs, which Bliizard Blade (the 3rd in side chain) does an extra 400ish (resists do play a part ofcourse) but thats 2400 dmg in bout 6 seconds, which most casters would be happy with

also get 2 insta interupts, and throw weapon is handy for that aswell (ofcourse you cant attack for 6 secs, but 99% sure u can still cast) thats rvr anyway, pve a vwer unbuffed can chain yellow/oranges non stop, and buffed can chain reds VERY easily, and lifetap your health back up, and im never OOE when farming, and i farm Hulks in DF with druid bb, and it takes so few heals that hes never oop either.
if your adament on using bard it would be slightly more difficult, and in that case id probably go shield spec tank, but you do lose out on d/q and s/c on bard (which im sure you know, but thought id mention that)
a good caster combo would be mana ment and light ment or chanter ofcourse, that hot is absolutely killer, and light ment is damn nice in rvr
stealther wise, rangers, with medium pf (self af becomes spec next patch (? or 1 after cant remember) can be great bow or melee rangers, infact awesome meleers.
the main problem with hero's (i dont have a lvl 50 1, so not the absolute best person to ask, but i think i know some thing) is just the genuine lack of abilities for keep sieges and even roam grps, the reduction in det has really hurt them, as shield champs can do the job almost as well, and get nice debuffs to help in assist trains.
anyway hope that helped
PS if u decide to roll a VWer there are a fair few (well 7ish) active atm you im sure could help u, or ask me anything and i can help
PPS Welcome to HIB