Okay, making portals from the nether works, making portals from the overworld just sends you to the first portal made. Portals from the nether dump you 'close' to a 1:8 ratio in the overworld. By close I mean coordinates translate 1:8, with 0,0 going to 0,0, but are off by as much as 10 blocks in X or Z, and you're at the mercy of the portal gods for your Y coordinate.
Some data:
Nether Portal Overworld portal
-18,35,-36 -125,12,-281 <--- first portal
-38,37,-46 -294,31,-378
21,52, 20 172,38, 156
EDIT: On another note, I hear the server's re-seed is being held off until there are a few members present to make the decision on what seed to use as a group. Here's my input: I will adapt or terraform a location if I can't find one that doesn't already meet the conditions needed for whatever it is that I decide to build, and I don't know what I'll build until I build it.