hiya,
You can use the VGA + Multisync monitor drivers to make WB display in VGA mode which will allow you to use your 1200 with most(all?) monitors without the need of an external scan-doubler. Most old games/demos won't let you use this mode but newer stuff like ScummVM AGA will work just fine.
I've also found out that some modern monitors like my BenQ 24" HD will display all the 1200's standard modes.
All you need is a simple RGB to VGA adapter from AmigaKit....job done.
Here's a video (no scan-doubler in sight) ->
videoOtherwise just wait for Jens to release the IndivsionAGA Mrk2 or try and hunt down a second hand Mrk1