ear defenders

[Zirax]

Before I embark on a trip to Lemans, I have standard ear plugs as well as frequency target ones... It's been on the cards for a while but does anyone have any reccomendations of what to look for? The EN352 seems to be standard spec.

I have found these which has an FM radio which will be handy,
http://cgi.ebay.co.uk/EAR-DEFENDERS-WITH-BUILT-IN-FM-RADIO_W0QQitemZ120427482838QQcmdZViewItemQQptZUK_H ome_Garden_GardenPowerTools_CA?hash=item1c0a098ed6 &_trksid=p3286.c0.m14&_trkparms=66%3A2|65%3A1|39%3 A1|240%3A1318|301%3A0|293%3A2|294%3A50

Or if they would be a bunch of arse,
http://cgi.ebay.co.uk/PELTOR-OPTIME-III-3-EAR-DEFENDERS-PROTECTORS-MUFFS_W0QQitemZ300313491983QQcmdZViewItemQQptZUK_B OI_ProtectiveGear_RL?hash=item45ec143a0f&_trksid=p 3286.c0.m14&_trkparms=66%3A2|65%3A1|39%3A1|240%3A1 318|301%3A0|293%3A3|294%3A50

One has an SnR of 25-30, the other 35db. Obviously higher is better, just wondering if anyone has used them at motorsport before? Would say 25dB be enough?

edit:-
Or even the middle ground of which has 30dB
http://cgi.ebay.co.uk/FOLDING-EAR-MU...3%3A1|294%3A50

I'm rather confused.