Yep, same me, on my home LE, 10.5.4 and 7.4.2 and it works really well. Not 1 problem yet in about 3 months of use.
I am on a mac mini (dual 1.8g, 2 gig ram) runs like a charm (can make out about 70 plugins, more than enough!).
If you are running tiger and it aint broke i would say stay till 7.8, their is no benefit to upgrade to leopard just yet (from what i can tell anyway).
Hope your studio is going well Guy, im moving to Sweden on 1st of Feb!!!! That's what girls do to you!! hahah
Looking for some work in Gothenburg Sweden so if anyone reads this and is knows of any please PM me, many thanks peoples!