There is no "best" derailleur for any particular situation. Get one rated to handle the range, at a price you can afford, and that has good reviews. Performance is more affected by how well you set up derailleur and cables, as well as chain and condition of cassette, than by individual model differences.
SOURCE: shimano rear cassette assembly instructions
Dive into the Shimano site and have fun...
http://techdocs.shimano.com/techdocs/index.jsp
SOURCE: Last season Shimano and several
The real question here is - are you having a problem and how can it be fixed?
Even full gruppos can cause users to ask us for adjustment advice.
OTOH, theoretically incompatible parts like Campi shifters and Shimano derailleurs can be made to work. I have several such pairings that work flawlessly. But then, I'm running 9-speed.
The thinner you go with cassette cogs the finer and less fault-tolerant everything has to work together.
As is attested to here: http://www.bikeforums.net/archive/index.php/t-623547.html
"AFAIK, there is no change to the RD's actuation ratio, so it should work."
http://cycle.shimano-eu.com/publish/content/global_cycle/en/nl/index/tech_support/faq_s/compatibility.download.-Par70parsys-0024-downloadFile.html/Road_charts_2009.pdf
http://www.parktool.com/blog/repair-help/rear-derailler-adjustments-derailleur
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