Go with Stevens if you are going to make all of the suggested changes. If you want a single shot the target action is very nice, but I doubt that you will see differences, unless you a really into serious BR type work. Stay with the round back actions more than anything as the flat back actions were never known to be really flat or machined accurately (the flat area at the rear of the receiver, not the action itself!) from all that I have read.
The basic Savage/Stevens action is damn fine :)
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