On board USB XDS100v2 JTAG debug - TMS570LS04x/03x
The fastest version in LQFP package seem to be TMS5702125BPGEQQ1 - 160 MHz, LQFP-144 ~$35
TODO: update with info on the newer smarter board
TMS570LC4357 is a 300MHz version with single and double (!) precision FPU but it's only available in BGA package. 337-Ball Grid Array, is it an option for DIY?