Lpc2000

Hi to all,
I'm new in ARM7 world, and now I'd like to buy jtag compatible interface 
for debugging/programming issues. I saw that Amontec offers interesting 
tool: "Cameleon" that can work as Macraigor's Raven, but i need opinion 
from experienced users of ARM7 processors. Also I'm considering UJTAG 
from Keil? Please help me to make right choice, or maybe you can propose 
to me other JTAG. I want to use it with gnu tools, or IDE's that support 
GNU compilers/tools like Keil.
Best regards,
Blagoj