Are you limiting yourself only to those two radios? I own the FRG100, and it's a damned fine radio but...I also own an Icom R75. In my opinion, the R75 is a lot more flexible as far as weak signal work. You can upgrade the radio with narrow SSB filters, while your are limited to a CW filter for the FRG100. Also, the FM unit is an option on the 100. The Icom also has DSP noise limiting and noise reduction, RF gain as well as attenuators. There's really a long list as to why I recommend the Icom over the Yaesu.
Forget the VR5000...go to
www.eham.net and check out the reviews on the 5000. Pretty mixed, but for the most part, not good.
You might ask why do I own an FRG100 as well? As I said, it's a damned fine radio, it fits nicely in the bedroom and sounds real nice for SW Broadcast.
Hope this helped you! If not, feel free to ask questions