Hi guys, Once again, thanks very much for the super feedback. I am very reassured that I am on the right track, both with the 705 and 400i. Although, the 705 seems to have the edge at present, especially with its ground balance capability. The beach capabilities are especially attractive. I will check out the Utube clips on it. Have you any comments on the 9 concentric coil which seems to be the standard coil that comes with the detector, which runs at 7.5kHz and is waterproof. The more specialist 18.75kHz Double-D elliptical coil seems to be the choice for gold prospecting, which would not be my application.
Matchimus's comments on the accessories being expensive is a worry! I believe I will not need to upgrade the coil from the standard 9" concentric (still learning about kHz, concentric Vs elliptical coils etc) as they seem to be quite expensive.
Thanks again for the feedback.
Issa