Can you give us an idea of the ones you have in mind; I'd say there isn't as much G-P knowledge out in the wild like other brands so it's better to set out what it is you are after. Apart from a small box of bits that will one day make the Calibre 352 quartz of my dreams I only have this one. Annoyingly I had a thread on this running on G-P's own customer forum with a good response from them but they've taken it down (the whole forum, that is).
It has a FEF movement in it and I'll see if I can find more info.