Well, if you are used to the Yaesu world, the FT-857 or 897 do quite well with computer control. Your 817 can be computer controlled as well, and if you need more "oomph" there are some amps to consider.

Instead of a new radio, here's a $pendy but great amp for the FT-817...
http://www.tokyohypower.com/hl-45b.html

This is a kit, and I've talked to a couple of stations using them...
http://site.hfprojectsyahoo.com/hf_packer-amp

Got two FT-857's, and used to run an 897. I also have a Flex 3000 SDR, and it's pretty cool. Also a Ten Tec Pegasus. I really like PC controlled rigs. Wouldn't necessarily dump the FT-817. It's a decent radio.