Nice find dude. The lipoly batts look a little overpriced, but everything else is priced ok, so I have a feeling the lipoly batts may be priced right. I use Kokam 145mah lipoly. I rememnber peying alot less for them, but it all depends on the output of those EZ batts. Those look like they would fit better. But the Kokam charger was much cheaper also. I think it was about $60. I’m speaking in US dollars and I got them at “homefly”. You might have troubles trying to get them outside the US from this company. Looks like a good on-line store you found. I’ll probably pick some stuff up from them.
As far as I know, the higher resistance a motor has, the faster it will go. Unfortunately I don’t know the resistance of bit motors, so I have nothing to compare the numbers to.
I say get some of those lipolys and try them out. They can’t be slower than nicads and they’ll almost definately weigh less.