Lpc2000

Wondering if anyone has any recommendations for a good TCP/IP stack.
I just assumed that if we switched to an ARM processor, there would be 
lots of stacks available, but I'm not finding many.

Several I've looked at are in the $10K range (very nicely done I'm 
sure, but too expensive for a small project).  Several embedded stack 
companies are now out of business also...

Main requirements are to support as many TCP levels as possible, in a 
minimal amount of RAM...for something under $1K.

Thanks in advance!