For the SFS: Well, most people like Acacia. I like it too. You can buy it from Heather's store or from Amazon.com. You start with a very low dose, like 1/4 teaspoon I think, and work your way up... That means that you take that dose for acouple of days while your body adjusts, then take 1/2 teaspoon, etc.
The pills are convenient for when you're on the go, i.e. at work and you don't want people to see you mixing some kind of white powder in your food, LOL. Fibercon is an example of a pill form SFS.
If you do want to cut back on the rice and potatoes, have you tried sweet potatoes and squash? I don't know exactly why you are trying to cut back on them, do you have to lose weight? If not, don't cut on them, rather add IF to your diet.
Snacks -- no, you need SF. Good snacks are baby food, bananas, apples, applesauce cups (those Mot's flavored ones are cool), toast with a little jam and almond butter.
I think the best meals are also the easiest ones. The less ingredients the more sure you are you won't react to them.
Try making meals with things like:
SF base: rice, potatoes, squash, eggplant, quinoa or pasta
IF things: onions, celery, peas, corn, peppers, tomatoes
Try fish too. You don't have to stick only to chicken and turkey, there's also fish and seafood (if you like it, yuck). They are usually safe. If unsure, search the boards or ask.
So, what I do is I "saute" some vegies in a little cooking spray and water (that means I try to fry them in water, LOL), until they are tender, add the SF base and some spices if I feel like it (salt, soy sauce, things like that). I also use brown rice and seem to tolerate it fine. You can also try that, you are a C, right? The IF in brown rice will be good for you and it is one of the least bothering whole grains.
Seriously, though, get a SFS. It works wonders.