which Ubuntu would you use for LTSP for next two years?

[john]

Hi all,

I've been through a successful first round of testing using Ubuntu
6.06 and LTSP 4.2 (two servers, 36 clients, six months) and now I am
ready to put in a much more robust installation, double the number of
clients and hopefully leave this system in place for the next two
years without significant re-working midstream. So my question is what
would YOU use and Why if you wanted to finish this task by the end of
the summer? My criteria are working, stable and supported.

1) Ubuntu 6.06 LTS and LTSP 4.2 since 6.06 will be supported for
several more years (any plans to backport LTSP 5 to Ubuntu 6.06)?
2) Fiesty/Edubuntu with ltsp 5.0
3) Centos (slightly provocative, I know) or whatever stable gets LTSP 5 next?

I didn't mention Gutsy since it doesn't look like it will be baked
until October?

I'll be interested to hear your answers.

John