How about something like this http://www.worldofmagic.net/cartsnap...229+StreetWear
for Setsuna? I know the bangs aren't as long and piecey as Sets', but that's the manliest wig that'd work. You could color the roots with a brown or black sharpie too.
If you wanna be more accurate, I'd suggest buying a longer wig (like a womanly one) and cutting and styling it to match his exactly, but if you're going for masculine, I think the above would look best.
As for being cheap, that wig is about $36 with the 40% discount. (Not including shipping, which shouldn't end up being more than $6) If you're interested in that or any wig on www.witchwigs.com
check out http://forums.cosplay.com/showthread...&postid=404048