new bar? no problem. find whatever width/rise is comfy.
brakes? no problem, but you'll probably need new levers as well. v-brakes use a different amount of cable pull. you could use your old brake levers, but they'd suck with the v's.
fork? easy. anything new is going to have disc mounts. your frame is new enough i'll assume it has a 1-1/8" headtube. and a threadless steerer/stem/headset setup. that'd run a bit more to convert all that.
disc? pretty much front, unless you want a whole lot of complication/money. if you'r frame isn't setup with disc mounts, you can get adapters, but they are not always the easiest way. for the cost of new wheels (need to be IS disc mount compatable), front and rear disc brakes/levers, whatever frame adapter you may need, and a new fork, bar, etc. it'd be easier to save for a new bike.
yeah, i'm at work tonight, and i'm bored, so here ya go.
try this: all this gets you a decent set of what you're looking for, for $372.97 plus shipping........
http://www.universalcycles.com/shopp...3&category=349
http://www.universalcycles.com/shopp...00&category=37
http://www.universalcycles.com/shopp...79&category=19
http://www.universalcycles.com/shopp...5&category=516
http://www.universalcycles.com/shopp...ls.php?id=4112
http://www.universalcycles.com/shopp...=68&category=8
if you wanted to go full front/rear discs, and needed new headset/stem stuff to run a new fork, i'd say save for a new ride. but if not, this'll get you rolling with minimal cash outlay, and minimal headache.