i'll take a shot at this one for you. im shooting the 350D in an ike housing with 2 ds-125's. I would highly suggest the DS-125, especially since you are getting the ike housing. It will give you a lot of power, and you will be able to take full advantage of the e-ttl, so you can get a perfect exposure almost every time. DO NOT SHOOT ON FULL AUTO! I would suggest shooting on either manual mode, or shooting aperture priority. If you do aperture priority though, i would suggest setting the camera to shoot at 1/200th only when you have the flash on (otherwise you can get some blurring). personally though, i would say do full manual, and set your shutter speed between 1/80th and 1/200th depending on how much background light you want. then you can use the wonderful ike knobs to keep the aperture selection button depressed. Then all you have to do is change your f-stop if you want to go for a different depth of field. good luck.
Thanks for your assistance.
Maybe you can help me with lenses. I have a Canon 17-85MM IS USM and Canon 60MM Macro.
I notice you use the 18-55 mm on the 350. How do you find it, do you find it shoots wide enough? I was going to buy the 10-22. But am not sure if it is really worth buying it, or just using the 17-85MM
Thanks
Danny
Depends how wide you want to go! After taking into account the crop factor, etc. the wide end of the 17-85 isn't that wide. It is a good lense if you aren;t really sure what you're going to be shooting size wise. If you want to shoot wide, get the 10-22! They're about £400 on ebay from hong kong.
A fairly standard entry level setup for the 20d now days is