... well clearly you're already at least somewhat into Soul Eater ... :Db Let's see ...
I definitely recommend Code Geass. Just not if you're excessively tired. It tends to ... well, it tends to be fairly dramatic, we'll say that. It's pretty serious most of the way through (except where Milly and/or Arthur for the most part is concerned). It isn't without its lulz, but it's definitely something you need to be able to pay attention to to appreciate.
The same point stands for xxxHOLiC (and the subsequent 'sequel' series, xxxHOLiC: KEI), except this one comes with more noodleTASTIC lulz. And despite what the fandom would have you believe, this and Geass have no gheys. Well, okay, Nina was totally gay for Euphie in Geass. But everybody knew that anyway.
If you can even find it anymore, check out Spiral (it might be listed as Spiral ~Suiri no Kizuna~ or something like that). It's like Detective Conan without the little kids and better art.
Also hard to find, but a seriously underrated gem: King of Bandit Jing (alternately Jing: King of Bandits). This one doesn't really have a longrunning plot to speak of -- in fact if there's a lengthy plot, I don't think I remember it going further than two episodes with the exception of the OAV, "King of Bandit Jing in Seventh Heaven" (which, it turns out, is much cooler as a prison than a family primetime show. It was a welcome surprise).
I haven't actually seen it yet, but my best friend raved continually about Moyashimon when they were watching it. It's apparently about a bunch of little viruses? I'm not sure, but it looks like fun.
Without really knowing your personal taste, I can't say much ... but I know if you enjoy Soul Eater you'll enjoy King of Bandit Jing, because the worlds are designed in a similarly whimsical fashion. :D At least, that's what interested me in Soul Eater to begin with.
Try not to have a horrid time out of the country, yeah? D: