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Don't know actual figures but stu Owen runs single box on his with decat and has been fine on track. Pretty sure pms actually give a noise level for them?
http://www.ebay.co.uk/itm/Autel-MD802-4-System-OBD2-Code-Graphing-Elite-Mxidiag-Diagnostic-Tool-Scanner-/182048484523?hash=item2a62ef6cab:g:ZiwAAOSwezVW0AIX
not sure if that's the best price, just the first one that came up.
autel are pretty good, think the 802? most apps and cheap ones are bloody useless, have seen numerous ones that either don't read codes or misread them.