I recently picked up The James Brand's the Benton LTD for the limited edition Field Notes it ships with.
If you're looking to stick with ballpoint ink, the Schmidt easyFLOW 9000 gives a smoother, fuller writing experience while maintaining the versatility. It smears a bit easier than regular ballpoints before it dries (in a few seconds).
It seems G2-based gel refills are harder to come by. I ended up with the Schneider Gelion 39. It's more liquid-y than common gel refills, but writes smoothly. I like the matte, archival look versus the glossier ballpoint alternatives.