Why do you want to change bases? If it ain't broke, don't fix it.
I bought a rifle a while back that had one of those little $20 weaver bases on it. I threw my scope on top and it shot great. Still, the rifle's intended purpose was for kind of rugged duty, so I want a more rugged scope base. I put a Nightforce scope base on. $100, if I remember right. The rifle doesn't shoot any better, but I just take comfort in knowing that I have a heavier duty rig.
If you are looking for pride of ownership, then go for it. EGW makes nice stuff, as do Seekins, Badger, Nightforce, Warne, etc.; but none of them are going to make your rifle shoot better, unless there's something wrong with what you have now.