First, go to Hobie Class Assn. Website and get the line lengths and diameters. (Resources > Technical Information)

You can go one size smaller on the mainsheet (to 5/16") and on the jibsheet (to 1/4") - that's what comes on the new boats and they run through the blocks easier.

Then download the Hobie HOTLINE from Mar/Apr 07 here. The "What's My Line?" article on page 12 explains all the differences in line choices.

You can buy line from Rick's on-line store (this site) or Annapolis Performance Sailing or Layline.

I like the bargain bin at APS - I've gotten a couple of mainsheets from that for about half price.

You can spend less than a $100 or several hundred dollars replacing your lines. The most expensive ones will be the mainsheet and the jib halyard on an Aussie system.