Is anyone able to suggest a good mod that touch races and birthsigns? Apart from bg2408's mod.

I use the COBL version (COBL balanced races). Those are the only ones I know about.

My favorite Birthsign mod is http://www.nexusmods.com/oblivion/mods/12149/? by tejon. I don't use any mods that change races, so I have nothing to suggest there.

I love Tejon's mods best.

How is performance with Birthsigns Expanded? I read a comment about heavy scripting in one of tejon's mods and that made me consider picking up his mods again in future playthrough, although I enjoyed his work before.

I haven't noticed a performance hit in my games. I use Fundament, nGCD and Willful Resistance quite a bit and they all seem to run fine.

But, then again, I'm not one of these people who plays with one eye on the framerate counter. So I may not be the best person to speak about framerates.