Ok, I'll answer as much as I can:
No you don't need to place it upside down to place it on the floor- you place it upside down if you ceiling mount it
(screws on the bottom) It has little feet, so that won't be an issue.
Define "dim lighting" Are we talking windows with the blinds shut lighting, or lights on a dimmer switch behind you sort of lightig? You may want to look at the HD1000U for ambient light (and just generally, because it is an amazing projector).
You have to pay for bulb warranties beyond the manufacturer's 90 days/100 hours, and they generally aren't worth it.
At 1.3 gain you should be fine projecting from the floor- as in you won't notice a difference in picture quality. If you ended up with a high gain screen, viewing angle might be a problem, but at 1.3 you'll be fine.
I still say the HD1000U + money set aside for a bulb is your best bet, and its still less than the HC3000U. I'll pm you more info.
No you don't need to place it upside down to place it on the floor- you place it upside down if you ceiling mount it

Define "dim lighting" Are we talking windows with the blinds shut lighting, or lights on a dimmer switch behind you sort of lightig? You may want to look at the HD1000U for ambient light (and just generally, because it is an amazing projector).
You have to pay for bulb warranties beyond the manufacturer's 90 days/100 hours, and they generally aren't worth it.
At 1.3 gain you should be fine projecting from the floor- as in you won't notice a difference in picture quality. If you ended up with a high gain screen, viewing angle might be a problem, but at 1.3 you'll be fine.
I still say the HD1000U + money set aside for a bulb is your best bet, and its still less than the HC3000U. I'll pm you more info.