B&W 801 crossovers


I am debating buying tube crossovers. I have a pair of B#W 801 speakers and was wondering what type of crossover or just have the speaker crossovers rebuilt. If rebuilt who?
gary5341
http://www.northcreekmusic.com/801web.html

I have B&W 801 series 3 and considered the north creek crossover upgrade. Never got around to it.
I loved the North Creek upgrade until I sold the Matrix series for my current N802's. Highly recommended if you can find them.