Why not do as I do, and get FREE SAMPLES from Freescale, OnSemi etc etc etc...
Sometimes you'll need to pay the shipping, but the value of the freebies far outweighs any postage costs!
I've built a barometric altimeter, good to 50K feet, and has 1 foot resolution using these samples.. No op amps required!!
Wow, they are pretty cool aren't they. Thanks for the info - I may use them in the future from some other ideas. At the moment I am enjoying playing around with what I am doing as I am learning stacks and progressing well.
Once I have it all completed and working I'll take photo's and post a completed cicruit.