| I strung my JC for the first couple of years after I got it with Blue Steels, and it sounded great, but then I tried a set of TI flats and man, it was like an entirely different instrument with a much fuller, richer bottom end. The Blue Steels will give you a snappier top end, which Jack makes good use of in his own unique style of playing, but if you play blues and country the way "regular" bass players do then the TIs will give you exactly the tone you want.
Don't let the price of the TIs scare you off, because you won't need to change them for a long time. (The set I'm currently using is at least 3 years old.) One thing that people often remark about the Blue Steels, and I agree, is that they need to be replaced often: They sound great for awhile and then, all of a sudden, the tone just falls out of 'em. So, the TIs are a bargain when you think in terms of how much you'll spend on strings over the long term.
I find that most other kinds of flats, including the Chromes you mentioned, are too dull and thumpy-sounding for my taste. That's great for some purposes, but I much prefer the TIs on the JC because they retain the thick, rich mids that the bass has to offer (in addition to bringing out the bottom end) -- it's as if the strings and bass were made for each other. Also, the TI's don't have the high-tension feel that most other flats have. In fact, some people don't like them for this very reason, but they're perfect for me. | 
