I would go for the Z1.
As for bulbs, apparently, PJ manufacturers have to supply bulbs for upto seven years after the product has ceased being sold or produced. I was told this by a Sanyo rep when I bought my first PJ - ironically, a Z1.
If your budget can stretch, why not look at the Z2 available from -
www.nexnix.co.uk
Finally, the Epson model is reviewed in this months Home Cinema Choice.
Hope this helps.
Cap