I am leaning towards trying to build a Dji F450 everything I hear is telling me it is a good training unit, and can add fpv later on. I am not sure where is the best place to start buying parts or radio and I don't want to buy the wrong things.
Look for local hobbyshops and other hobbyists. Failing that, head to RCGroups - lots of newbies there and lots of people who like to help without fear of a hidden agenda (read, sales).
I want to learn to fly well before moving up and will need something I can repair along the way. I am leaning towards the Naza m lite but so far I am not sure on the Radio. I want to take advantage of all the features of the Naza and especially the ones that will bring it down safe should I have a problem.
Once you do get your stuff together, I would strongly advise you to fly a few weeks WITHOUT the safeties. They're not reliable, and you need to fall back on your skill when they fail.
And I want to make sure that when I move to the Fpv the radio will work well and at a good distance.
This is where things get a bit complicated, which is not what you want to hear. There are a number of frequency ranges to choose from, for both the transmitter and for the FPV signal. Eg, for FPV the common ones are 5.8Ghz (good quality, shortish distance, no penetration so line-of-sight only), 2.4Ghz (clashes with most transmitters), 1.2Ghz (legal issues, gets interference from the transmitter, big antenna, GREAT penetration and distance).
Any suggestions without going too high in price? what are your thoughts on the Spektrum DX7s I would like to stay around $250
I use the DX7s and I love it - however, it has limitations I wasn't aware of before as I was a newbie, so I'm looking into the DX9 as a nice upgrade. I STILL am a newbie, and although I've looked at other 'brands' I'm too lacking in knowledge to go there yet.
The DX7s has 7 channels (throttle, rudder, etc), only ONE switch has three positions and the aux channels are dials/knobs... no sliders. This doesn't sound like a big deal, but most flight controllers nowadays have safe, sport and manual modes (for example, the actual terms are different). Then you add in height hold, return to home, etc and your channel count starts to mount up. The DX9 has sliders on the back - perfect for gimbal control, as I find the aux knob very unintuitive.
Other options are Frsky, Hitec, Turnigy, Walkera, and a bunch of others.
Now here's the kicker - there isn't a common protocol for radio communications, so the receivers are NOT compatible. Some transmitters let you use addon modules - some plug in, others need soldering - but that's a level of tinkering I'm not prepared to deal with right now.
This is where the Walkera Devo line - cheap and not the greatest build quality - wins: the open source 'hack' called DeviationX is a huge winner, as it lets you use most (all?) of those protocols without any hardware modifications.
For now, I'm staying with Spektrum. Yes, a lot of it is great marketing and yes, feature-wise the others win hands down, but support is excellent, I love BNF and have 100% satisfaction with all my Eflite/HorizonHobby quads... unlike with the others.
TL;DR: You can't rely on advice from a single thread. You have a lot of homework ahead of you. Good luck.