I'm abit skeptical about the Gigatracker. I own an Archos Gmini 400 myself.
I've heard recordings done with its line-in, they sound pretty good,
can't hear any difference from those done line-in to my old D7.
But it has one limitation. If you're recording acoustic or anything
softer,you will need a preamp definitely. The line-in to the Gmini
has no gain.. The levels U adjust on it, is just simply digital attenuation
handled by the software. Preamp wise, I would prefer the Reactive
Sounds "boost box", where the gain is not fixed to just 3 options,
and it has a clipping led, very useful for stealthers.
Speaking of stealthing, if you're looking at the gigatracker, you're
looking for a stealth rig. True, the gigatracker is a nice package plus
its custom line-in plug is far better than the one provided by Archos.
However, if U wish to adjust levels, you have to open the box
and press a button on the 400 to take the screen off screen saver mode.
*Unless of course U wish to tape with the screen turned on permanently, this will
drain battery life* Also, I dun like the way on the preamp where
U have to adjust both the left and right channels, its too troublesome.
Finally, I dun quite get how U can tape continously on 32 hrs with the Gigatrackers.
At best, the 400 can only record 7-9 hrs straight with a single battery charge.