The goood Colon Cleanses that I've heard about are the Bentonite & psyllium (simplest & least expensive), Holistic Horizons (good, no herbal laxatives), Experience (no herbal lax) and Dr. Schulze (with herbal laxatives - especially good for people who have chronic constipation). Some people respond well to the added herbs and others find it tooo much. (just something I've noticed)
The link below is info on B&P's (in case you haven't read it yet - I always hand it out!)
You can do a parasite cleanse and Bowel Cleanse at the same time. The scheduling is a bit tricky though...as both have to be taken on an empty stomach. Not impossible, though!