you make it sound like an "and/or" situation. economic realities will dictate what shows you can attend.
daft punk is definitely the better show, especially if you've never seen them before. those two robots don't tour often, and you've seen on this board what kind of raving fanatics they turn people into. but you'll need something like $800-$1000 to pull it off, if not more. airfare & accomodations are only getting more expensive with time, and festival tickets *may* yet sell out - so you'd best come up with a good chunk of that cash ASAP.
justice in philly could be done for a fraction as much - ticket is cheaper, you can get there and back same day so accomodations aren't mandatory, you might be able to get a ride (if not buses are cheap), less food to buy, etc.
i'm not sure what your situation is, but justice shouldn't be that hard to pull off. DP in vegas, on the other hand, is a much much bigger commitment. and i'd think that if you can swing daft punk, you can probably do the justice show as well.
or, buy some land. and read a mu'fuckin book.
