Ignoring the genre dispute going on, here is a second rough mix with (hopefully) some of the original issues solved...
Kira? (2nd rough mix, some scratch vox tracks)
Rhythm guitars?
Louder. More bottom end. Run through the UAD Fairchild (the 14 day trial beckoned me, and now I guess I'm going to have to cough up the $150!)
Drums?
Quieter in mix, but tried to keep transients intact and punchy. Drums are still quite prominent to be honest, but that's part of this style. Rewritten some parts in places to make fills a bit more realistic. Got a bit carried away with compressing the room mics (sounds a bit weird saying that when its fake drums!) and ended up bringing the cymbals forward too much in the mix. Again, something else on my list to sort!
Lead guitar parts?
Recovered some of the parts that were 'lost' in the last rough mix. Some bits (tapping part before second chorus) are now a bit too loud... need to sort this (the tapping needs to be retracked anyway to be tighter).
Bass?
Still not sure here

I've got an awful monitoring setup and can't afford the pair of KRK RP6s I've been hankering after at the moment. I'm finding it really hard to judge the bass at the moment, as my 'monitors' roll off at around 100hz (and my untreated room gives a nice boom around 125hz)... not ideal!
Vocals?
Obviously not to everyones tastes! Thought it actually sounded a bit like Hellogoodbye in the intro. These are just scratch tracks that we did quickly to see how things would sit in the mix (and also whether vocals recorded in my untreated and bad-sounding bedroom would be acceptable!). I've been given a run-through of the final vocals and its going to be a Four Year Strong style thing, with a snappy call and response thing going on between two vocalists in the verses.
Entire mix?
Still pushed into a limiter (or two

). I don't like the loudness wars, but I do push the levels a bit (especially when they're just going to end up as 64kbps MP3s on Myspace). There's no audible pumping, apart from maybe where I experimented with sidechaining a compressor on the rhythm parts (to the kick and snare) in the subtle attempt to slightly duck them to allow the drums to punch through. I think I've done an acceptable job at keeping it punchy, but I'm open for other opinions...
EDIT... if someone could do me a big big favour
... As I mentioned above, my current monitoring setup is really letting my down and I'm having a hard time judging the low end of this track. This is a link to another version of this mix with slightly more bass. If someone could compare the two (3b and 3c) and suggest which one is more 'balanced' then that would be great! I have a feeling 3b might be a bit muddy in the low end. I went to a verrry loud gig last night, so my hearing is a bit off today anyway! Cheers.