I have the F44 and really like it. Plenty deep, lots of features, light weight and we'll balanced. Not to mention weatherproof. Just my $.02. Good luck with whatever you choose.
I recently bought an F44 with the 11" DD coil. . It has a lot of features for the benjamins in my opinion. Manual and automatic ground balancing, programmable audio, custom mode, large readout, weatherproof, uses 2 AA batteries and is very light weight.. I only have about 5 or 6 hours on it and it does go deep. So far, so good. (has a nice warranty too)