The problem with camcorders now is that you need to ask are you just needing a " memory maker" or are you keen on very well shot video?
Yours is an unusual depature from posts from folk who want to stop at £80-100 max for a "Full HD camcorder with 5.1 sound" and Maybe good stills but fit in a back pocket..


!
What you want to do should determine what you get. Bigger kit may not lend itself to portability but will be a hugh benefit if you use at a Family functions where you are the main Guy ( by default)
For holidays ect .. the TM900 will be more than enough and is guaranteed to be much better than anything your current SD MiniDV can give you
In the past you had Pocket friendly consumer kit, the Higher end consumer kit, followed by Prosumer" / Semi Pro kit
Then Pro kit
In effect you got into a different territory when you spend above £1500 upwards up till £3000 ect
For the extra you got larger camcorders with big fast lenses and larger sensors . with lots of manual controls ability to used balanced Mic input, and as you went upwards lens changeability
Since then it seems you have high end consumer kit , nothing in between then costly kit most folk would nnot buy unless revenue bearing
Along with this came the demise of tape.. slowly because tape was the Pro choice as the Non tape consumer quality evolved and the expensive Non tape Pro kit dropped in price
There is no doubt that a lot of the Consumer higher end kit are capable of very good quality video but smaller build and empahsision consumer friendly features like GPS ,face recognition , smile detectot...

have given way to videography related tools
DSLRs have also muddied the water by offering video capability with large sensors and interchangeable lenses but they are not your typical point and shoot video device!
As Such it may well be a good idea to stick with the likes of the TM900 because the camcorder market is still evolving to the point of not being sure that what you buy now will still be your pride and joy in 10 years time
Otheres may suggest different
No you dont
The Sony NEX are a new concept by Sony to use bigger sensors and the concept of fast interchangeable lens to create a "Semi Pro" camcorder . It is loved by some but has not been a runaway hit . I dont have much hands on experience with it.. Some say it is a DSLR video camera shaped like a camcorder!
If you want a cut about the consumer offereings. Panasonics AVCCAM range are worth looking at, and they have released a new range only recently
Some wouuld say the HMC40 is not really better than its TM700/900 mates..
The
AG HMC150 is rather very good though and I think, a notch above the consumer models for just about £2500
HTH