I'm currently in the early prep stages for a campaign with my local group of gamers, and I'm looking for a good system to use.
The vast majority of my group's experience has been with AD&D, DnD3.0,3.5 and 4e, along with a stint in pathfinder land as well.
The campaign I'm planning is quite a bit different than our normal fare, and I'm not thinking that the systems we're used to are going to cut it without some major changes. Each player is going to have a minimum of two characters, hailing from different time periods. The game will shift between a modern setting (influenced by TSW, World of Darkness and others) and a pseudo traditional fantasy setting (influenced by A song of Ice and Fire and others.) The shifting between them will be somewhat similar to Ted Dekker's The Circle series.
At this point I'm pretty much open to anything. I do own a copy of the GURPS core books, which I've looked at, but never played. I'd like to avoid using two systems (one for modern and one for fantasy) as the timelines will converge late game.
Sooooo, any suggestions for a system that is flexible, simple, and would mesh well with both settings?
Thanks for any and all help/suggestions!