I bought this slider a few years ago and, though it isn't perfect (I still have to run the footage through a warp stabilizer), it absolutely gets the job done.

I use this manfrotto fluid head which has been excellent. I did have to get a [3/8" to 1/4" converter](Oben 3/8"-16 to 1/4"-20 Reducer Bushing) since the tripod head has different threading, but it's a cheap fix.