Well, one way to look at it is that if you are only looking at $30 out of pocket, it is not so much an "upgrade" as it is just playing in the garage for an hour or two to see how you like the parts (that are already just sitting there) on your old frame
Shoot, if you don't like it, just swap them back. Better to have good parts on a Low end frame than just sitting somewhere, IMO.
That is pretty much what I am doing.