Despite the long GOP issue in AVCHD I’d choose it over HDV in a heartbeat. I’ve done some shooting and editing in both formats and transcode to ProRes 422, the AVCHD holds up better depending on the frame rate and size you’re shooting.
The cameras were very different in my case a Sony HVR-Z1U and a Panasonic GH1 still camera with a fast lens.
I’ve had the best results in AVCHD at 720p/30, it transcodes better to 24p or 29.97 depending on your needs though you may be shooting 25p in Romania anyway. YMMV.