I recently picked up a Stellarvue F60M finder to use as a guidescope. Its very light (only 680g with tuberings) and takes a 1.25 inch eyepiece so the DSI fits snugly. I use it with a 2x barlow.
Total cost (delivered to Sydney) with tube rings was $305. Have a chat to Peter Read at SDM -
peteread@mcmedia.com.au
It works a treat for me
Pete