The C&L 73 I have would work perfect with your combo. I had a similar setup a few years ago and it worked FLAWLESS. I have it for sale in the classifieds if you are interested.
Most people believe the Pro-m is the best and most accurate. I have the C&L 73mm and I have had no problems at all. the pro-m needs to be sent back for re-calibration if you decide to upgrade injectors..... With the C&L you simply need to replace tube sizes.
regardless of which you chose, both work by 'tricking' the computer. the pro-m just seems, by most, to be more accurate.
before anyone posts back wanting to start an argument about how their pro-m works, search through some of the earlier posts. theres also a good site on the web which explains exactly how each works.