ENTIRELY PARTIAL LIST, because this is just off the top of my head (and grouped into categories by the way I remember them, which may not make sense to anyone):

I know you said you've seen all of Speranza's stuff, but I still just have to mention at least the Talking Heads ones, because OMG I love them so much. Life During Wartime! Lifetime Piling Up! <3 <3 <3! (I also totally second that rec of Running Down a Dream, btw, and make sure to read Eunice's commentary on it, too. Hee!)

barkley's Requiem (http://www.bonuspoints.net/vidstuff/) (while you're there, you should probably grab at least Separate Ways, too - hee)
merryish's Hello (http://merryish.livejournal.com/154524.html)
permetaform's Welcome Home (http://permetaform.livejournal.com/319048.html)

mamorou22's Cartoon Heroes (http://www.viddish.org/sga.html) (Actually, she has several excellent vids, but Cartoon Heroes is THE vid you should watch if you only watch one.)

lim and newkidfan should not be missed; they're doing really fascinating things with vids. Sadly, I can't find links to announcements for lim's stuff, but my favorite of hers is probably This Is How It Works. (I can upload it for you if you can't find it, either.) To watch it and get it, you'll need to have read synecdochic's Freedom's Just Another Word for Nothing Left to Lose (http://www.kekkai.org/synecdochic/sga/freedoms_just_another_word.html), but if you haven't done that yet, you totally need to, so no harm done. You can find all of newkidfan's vids here (http://newkidfan.livejournal.com/tag/fan:+vids).

zoetrope's Absolutely Cuckoo (http://zoetrope.livejournal.com/116620.html) is deeply adorable and makes me happy whenever I see it.

jescaflowne's Another Sunday (http://jescaflowne.livejournal.com/76458.html) is a very happy place vid for me, but I first watched it at a con, and I'm not sure how well it would translate to the living room. Still, very wonderful and adorable and teamy.

And, OMG, I'm running out of time for this right now. But. Um. I love a LOT of SGA vids. I think you should, too! I have more recs for you! We haven't gotten into the "character" or "short and really cute" categories in my head yet!