Given that Borland does not exist anymore, I'd say go with the Visual Studio Express edition. :blink: It's free and has one of the best "fat" IDEs in the industry. (And, by "fat", I mean full of developer-supportive technologies as simple as syntax coloring, to as complicated as assisting refactoring.)
Another reason to go for VS, fortunately or unfortunately, is because so many others use it, lots of times you can find project files that can seamlessly be opened on your box.
PS: BTW, after multiple jumps, C++ Builder can be found with Embarcadero Technologies. They started out making DB tools, and have migrated into other modeling/coding markets. Not sure why they are selling a C++ IDE, so the chance of it being dropped back into the void for "strategic reasons" is non-negligible.