yeah.. a lot of ppl has tried and tested. Myself an ex owner of the brevis. U will notice the latest ones comes with a flip now. Letus Mini/Extreme and Brevis Flip has good reviews. There is another brevis flip for sale now at about SGD2800 including rails and imaging elements for medium n small cams.
If u r to import either yourself, the freight cost is controlled by the mfg and u have NO choice on the forwarder. The freight cost about SGD200. Total plus GST (CIF) convert to SGD for Letus Extreme now is about SGD3200. That is with only 1 imaging element plus rails 45mm. etc.
Dun forget u need to buy some SLR lens. Unless u go for old zoom lens like Canon FD or the Nikkor, u should cater 1.5k for 28mm/35mm, 50mm F1.4, 85mm F1.8 for a good setup. Rails r a must if u need the flip.
I would say SGD4-5k would be enuf for a decent setup. Unforutnately the investment is 2x your camcorder. So plan carefully b4 u plunge into. Dun end up having enuf to buy the setup but no $ for the lens. Fast lens is really essential for DOF adapter due to light loss. Good luck!