Audio Research LS26 vs. LS17

I really want to buy one but money is an issue. I can wait a few more months and save enough to buy the LS26 but I can do the LS17 soon. What major differences will I hear or functions will I lose/gain between the two. Both dealers in my area only have the Ref3. I love the sound of it but 10K is way out of reach for me. Anyone who has had both or heard both, I could use your input here. Thanks.