i currently own a fisher f2 and im looking to upgrade to something that can pick up coins better and deeper, i have a few options and im looking under 800.00 what would the best coin hunting machine, i was thinking possibly the fisher f4, f5, f70, teknetics omega 8000, Teknetics T2, used minelab safari, minelab 705, explorer II , garrett at pro, garrett gti 1500 etc. any info on the best coin hunting machine, fastest recovery, would be appreciated thank you!