You're getting a lot of "Make sure you get the same bow that I have!" answers, which tend to be a load of bollocks.
Now, I happen to own a Silvertip, and have owned an SA3. Both are wonderful bows.
I haven't seen or shot a Kwikstik, but I know from reading here that they have a strong reputation and do the job with excellence.
All these bows have a strong following.
If you can, shoot them all before deciding. If, like me, there is no way for you to do that, simply go with the one you like the looks of - you will not be disappointed no matter what decision you make.