I've got a Boss Chorus, MXR Carbon Copy & Neunaber Wet Reverb in the loop. In that order.
Out front i've got Guitar>Keeley 4 Knob Compressor>Boss Tuner>TS9>NS2>Ditto Looper>Amp
Have the Keeley & Reverb(v low) running at all times, use the chorus occasionally for cleans. Delay for cleans & solos. TS9 comes on for channels 2,3 & 4(when I use it)
The VH4 comes into its own with boost & overdrive. The amp is pretty dry on it's own, imo, so it really seems to work well with ancillary equipment.