I've been using the following 2.5x script at 480x480 resolution with good results. Theres no dynamic filtering because on the AVI sources I've tried it seems to increase filesize, but try it yourself as I've only tested on three or four movies so it could just be those particular sources.
Code:
AVISource(- your avi file here -)
Limiter()
Blockbuster(method="noise",detail_min=1,detail_max=8,variance=0.3,seed=5823)
ATC(3,6,7,0.5,false)
TemporalSoften(2,7,7,3,2)
ASharp(1,3)
MergeChroma(Blur(1.58))
MergeLuma(Blur(0.2))
BicubicResize(-your resize here-)
Limiter()