Personally I prefer a metrotech 9890 great unit, and has different frequency selectors so if what your hooked up to doesn't like one tou can switch. RD's seem to be good units too, but I never liked em they read opposite to a 9890, and I couldn't get used to it.
Whatever locator I would stay with a manufacturer that specializes in locators, Vermeer & Ditch Witch make great digging equipment that's what they specialize in.
Couple other things, someone recommended a metro tech 810, it locates everything, sometimes all at once, in other words that frequency tends to bleed off on other things. Last time I used one I was hooked onto a transformer and bled right off onto a gas line. Cuss Cuss Cuss. Luckily I knew it and didn't take a hit. Somebody mentioned gas lines, the secret is that when you hook up to a meter the signal from the locator will turn towards to pressure side when it gets to the main-better ground on the high pressure end. You will need to hook on to the neighbor also to get the downstream side of the main. Good Luck
