Nice pickup. Being the frugal miser that I am, I'm not sure if I'd replace the grates and flavorizer bars just yet. You might be able clean them up and get a few more years out them before replacing. Then again, if you are going to rehab the rest of the grill and get it all spiffy looking you might want some nice shiny new stuff on the inside as well
If you do opt to replace the flavorizers, I'd go with some SS ones made by RCPlanebuyer on Ebay.
http://www.ebay.com/sch/rcplanebuyer/m.html?_ipg=50&_sop=12&_rdc=1. They are thicker gauge and less expensive than OEM Weber bars.
If you want to contact him directly outside of ebay, send me a PM and I will send you his contact info.
If you are feeling really froggy, he makes some awesome SS rod grates as well. They aren't cheap, but then again, you'll never have to replace them.