Lpc2000

I just got an Olimex LPC-H2294 and have a few quesions.

First, which is the best GCC toolchain to use on Windows. So far, I've
found:

GNUARM:
gcc-3.4.3, insight-6.1 + newlib 1.12.0
http://www.gnuarm.com

Macraigor:
gcc 3.4.0, gdb, insight-6.1-macraigor + glibc
+ their own cygwin distro?
http://www.macraigor.com/full_gnu.htm

CodeSourcery:
gcc + newlib (in EABI or Legacy interfaces?)
new distro May 1 to include gdb & insight
http://www.codesourcery.com/gnu_toolchains/arm.html

What are the tradeoffs? I've heard you can't debug in flash with GNU
tools. I only have a USB cable now, do I need a Wiggler to debug? And
if I have to debug in SRAM how can I use external memory? I'd like to
have access to 1MB as 16K seems a bit tight...

Thanks,
Brian