Is there ANY WAY to become a vampire again once cured? Like, a way to reset it? I played as a vampire, hated it, and now have my vile lair with convenient feeding mortal included and want to become one again. Any clues? I know I can cheat it with a console command once, but I'd rather just be able to have the risk of catching vampirism while killing them in vampire lairs.

There is a potion mod...

http://www.tesnexus.com/downloads/file.php?id=2305

Which turns you into a vampire.

erm.. cant you type coc testinghall and find a door leading to a place that tests vampirism.. last time i was in there there was a stone that changed you into a vampire when you clicked on it

It's possible, but there are a number of scripting things which would need to be altered which would conflict heavily with other vampirism mods. And you'd still end up aging every time, among other feature changes which on its own is a fairly bad thing. You would also be unable to do the vampirism quests or anything related over again, so anything that might currently cure you probably wouldn't work past the first time.

same as the other dude, type exactly-
~ player.coc testinghall
then, turn 180degrees, you should be facing a little piece of wall between two rooms, to your left is the door you want to go in. go into that door. then there are 2 tombstones, one will make you a level 1 vampire,(25) , and the other will make you a full vampire, (100). theres also a victim.
And then the only way to get out is another code, i use-player.coc icmarketdistrict02
takes you to the imperial markets. Also in the testing hall if you didnt know, there's a room filled with almost every piece of armor and a room filled with almost every weapons. so thats also good.