You might consider the optional Yaesu Power supply that snaps into the bottom of that radio instead of the Astron. It makes it a REALLY clean, portable package that takes up less desk space. I have that same setup (FT-897, AT-897, FP-30 internal power supply) and it really makes a wonderful, go-everywhere package.
For the same price you might be right on the FP-30,I will only be useing it moble once or twice a year thats why I was going with the RS35m,I have room for the external PS but now you have me thinking...O the pain heeheehee...
I will be running my power thru my APC XP900 so I dont have to worry either way.