Similar to the above, it was pretty much my best xmas ever when I got the 8860. I ruined it though, built it once on xmas day then somehow lost the instructions so could never build it again (my best guess is that they were still in the box when that got thrown away). Once I got my Lego back from my mums a few years ago tracking down instructions on the internet and rebuilding it was the first thing I did. Since then I seem to have picked up a couple more as I seem to have at least three now.
8860, 8865 and 8880 are ones I'm trying to revive as I have fond memories of them , 8860 being my first Lego Technic Set when I was a kid. Excellent set, I always remember not quite getting the gearing to run smooth. Even today it still has that clutch click every so often, but it was the start of the super car kits we get today.
I also had quite a few others, such as go karts, arctic explorer sets which had those cool technic figures which were much better IMO then mini figures and I also had forklifts and excavators with pneumatics , even had a tractor - and been slowly trying to find some of them, as I sadly lost pretty much all of them.
Set 8860 I restored a few months back, brought such great memories back. And you can get the set for less then £60 if you shop around, older Technic sets aren't worth much, priceless for memories though.