Iron Keld gets my vote too… more for some ace memories of the best ride ever. And a couple of jars in the Drunken Duck before hand probably helped.
I found a nice wee one at Woodland the other day too – very straight forward but a lovely flow… rather enjoyed it and will be back for another go I think.
Then there is Dumyat circa a few years back. Last time I was up there (before moving south) it had lost some of it's charm. But back when I moved to Stirling around 2001/2ish the descent down that main track was just stonking.
I have it on good authority that Parkamoor is a bit special too though, so shall try and get out there in the next couple of weeks to check it out.