If you're still trying to decide on a Z3 or similar, like an AE700 or TX100, then I say go for the Z3. I've spent about 4 months learning about projectors from scratch and waiting for the prices to fit my budget, and I've finally got mine - the Z3.
So far I've only used a PC with S-video - better than I expected - Gamecube by composite - ditto - and I'm pretty damn pleased with the PC via VGA. I just want to get a DVI-HDMI lead now so I can get the best connection to it.
It's exactly the size of pic I wanted (as big as my room allows), it's brighter during daylight than I expected, my room isn't as dark as I'd like it to be at night but the Z3 is great then, and it really is almost silent in it's low lamp mode - no really. It has 2 automatic modes to vary the lamp brightness with the picture, but in low lamp ("theatre black") you'll only hear it if you're watching silent movies! Oh, and it looks pretty gorgeous too (although I wish I'd got the silver one).
I'd say now it's available for ~£800 (

) and comes with a free voucher for a replacement lamp, you're getting a complete bargain. I nearly bought it for £999 without the lamp

but spent £890... you can't win them all...
Got it from Ivojo who have had loads of excellent reports on here, and their service has been friendly and helpful. There was a bit of a delay in getting it because I bought it on 6 month interest free and it took a week for the paperwork to get sorted out through the post, but that wasn't Ivojo's fault. In fact Ken Davies arranged an extra quick delivery for me, to make up for the delay with their finance company mucking about. I know some other retailers that I considered charge for pixelchecking, Ivojo don't.
So basically the Z3 is a fantastic projector, once you've got it take a look at the long thread from Rone with some settings to try and it gets even better. It's got brilliant picture quality as it stands and can be made even better. If you don't like tweaking then you'll be happy when you turn it on, and if you prefer fiddling to watching then it's a dream. And save yourself concern with who to buy from - use Ivojo and you're laughing.
Happy bunny
DM