since u're born exactly a year and a day after me, i feel a certain kinship that compells me to reply...
i dunno bout u, but i'm in my soph year in college, and i seriously spent WAAYY too much money last year. it's not even that my dad got on my case about it (he didn't mind that much), but i've learnt that it's just good to get into the habit of conserving money, and the best time to start is when u're in college when u've just begun life away from ur parents (if u're plodding along the well-trodden path of education that most conformists like me tend to, then u've just started ur freshman year...). okay, enuff with the annoying pedantic advice based on ungrounded assumptions about u, now for some more applicable advice based on stuff u've told us. heh, sorry about that, i just had to get it outta my system since i give the same schpiel to everyone i know who's just starting college...
with my advice in mind, i say ur best option is the er6. however, if u really have no budget in mind, do as Magicthyse says, not with the orpheus thing
but with the having a portable rig and a separate big rig thing. a lotta gamers i've met really like using senns (HD580 or 600) for gaming, so u mite wanna look into that. that could also double for ur big rig, plus it's great for most of the music u listen to (tho i think the beyer sound and the audio technica w100/2002 sound is much better fitted for classical). if u want a separate portable rig, definitely go with ety4s + meta42, and an added bonus is that if u buy the senns, the etys will sound more appropriate for those classical sessions imho.
hope this helped (without offending u too much)!
edit: btw, if u REALLY have a lotta money and u buy meta42, senn 600, AND ety4s, and u're still craving to spend more, consider buying some tube amps to really maximize ur senn sound... and while u're at it, ATH-W2002 for an unbeatable classical sound...
hehe, it's like i'm living out all my wildest spending spree dreams thru my advice to u...