John,
I know full well the quality and efficiency of T5's vs T8's, however the T8 fixtures I've got didn't cost me anything. So the savings of a $2-3K lighting package will allow me to spend in other areas. If someday budget allows perhaps I'll upgrade to T5's or maybe LED's. But for now the priority is getting a functioning shop.
I like your ideas on having some A/B switching. I've strongly considered that, but have not yet flushed out the exact design/layout.
Thanks!
NWB