"What you usually end up having to roll in your own is some methodology for doing code download, test and debugging."

OK - I see what you mean.

"Now I suppose that a Cygnal style JTAG debugging system with hardware breakpoints, watch points, register & memory sniffing, and single step and reset control is available from some where as IP it is yet another piece to buy, design in, and get working."

Hmmm - do any of these cores come with all that ready built in?

There's a page on the Keil site about support for various "cores" - haven't really looked into it.

"We cannot also forget the more generic types of chips such as Cygnal and Triscend have on board FLASH"

Unfortunately, Triscend don't do on-chip Flash. :-(
That's why Steve hates 'em