I've had a Dolphin Diagnostic which has served me well, but it's time for a new one (old one runs irregular patterns, misses spots repeatedly, struggles up walls). I want a new one with a good warranty but the choices and variations in naming are making it really frustrating (they need a good/better/best structure, not 20 random names/numbers). Not afraid of spending money for a good one but obviously want to get the best bang for my buck. Anyone have any guidance or insight?