Link: http://www.findmespot.com

There is a transition under way from the current generation of ELTs based on the 121.5 MHz frequency to the new generation based on 406 MHz. This promises greater transmit range and reliability. The only snag is that the new ELTs cost more than $1k.
Mark Zeitlin has pointed us to a supplemental solution which is based on GPS technology. The only current drawback is that the unit does not have a crash detector, although it might be possible to connect one to it (assuming that the crash does not destroy the connection...).