Bill,
I second the IPD swaybars and their HD endlinks. With more pull on the original endlinks from heavier bars, the original endlinks just don't hold up. I also have the Bilst. TC's all around on my '98 S70 T5. You'll love the improved handling!
That said, if you are not mechanically inclined, get someone to install these swaybars for you...dropping the subframe to pull the front one (original one) out and put the new one in is a pain in the arse. I can send you directions on the how-to from VADIS if you want. Just email me (click on the envelope next to my name in this thread).

Also, on a related note, after you get your original swaybars out, note the color of paint splashed on them. I blieve mine had a blue dot painted on. If you advertise your old ones on Volvospeed.com's message board, for sale section with the information about the paint color on them, older 850 owners will buy them as these are much beefier than what they have, and like another poster said, some don't even have a rear bar, so they are in demand. If you sell your old ones you'll recoup some of the $$ you've spent on getting the newer IPD sways.

Good luck!
--
1998 S70 T5 Emarald Green Metallic (125K), 2004 V70 2.5T Ruby Red (45K), Previous Owner of Black '94 850 Turbo Wagon (Sold at 140K and miss her). My cars have been running so well lately they've got me worried.