The lite isn't a Topre. The noise will be roughly the same on both keyboards, I would think.
You might want to look into a Sun Type 6 USB keyboard. Can be had for about half the HHKB lite, and is the layout the HHKB is based on. Plus, you can get extra keys on the left side to use for whatever you want, if you xmodmap them. There are some hacks necessary to make them recognizable, though.
Anyway, I find both the Sun and the HHKB lite to feel basically the same, with a slight edge to the Sun. But it is full size (and then some).