I think Bose-X has got it right.
Self-activating ELT's with integral GPS cost a fortune currently - something in the region of £1,500-£2,000.
By purchasing a PLB with GPS (£250), you are effectively equipping yourself with the most technically advanced piece of safety equipment affordable to the average GA pilot. Insurance companies wouldn't stand a snowball's chance in court of refusing payouts on the grounds of not being 'legally' equipped for flight in the Netherlands.
As Bose says, file your flight plans with the Hex code of your PLBs included in field 18. As to rampchecking, it's a gamble, but the odds are greatly stacked in your favour.
All this will be mute by 2012 (or maybe sooner) anyway, as EASA will ultimately decide on whether ELTs, PLBs, or either, will be mandated for carriage within Europe. And given the quantity of PLBs already sold and in use across Europe, plus the fact that they offer better rescue chances - your aircraft could sink with the ELT on board before SAR locates you, and a PLB directs SAR to the individual not the aircraft - I would be very surprised if ELTs are the only locator beacons mandated by EASA. Mind you, EASA don't appear to have the best reputation for throwing logic at new regulatory proposals...
jez