Hello and welcome.
That's a bit of a jump start here at rwi, 1st post with clichè question that may earn you the wrath of most members. But hey, I'm one of the good cops (mostly)! You have 24 RWI trusted dealers to choose from (geektime isn't one here):
The websites & email addresses listed here are the only one to be used. Any other website found online or in a post other than from the dealer itself are not recommended Be careful, copycat websites are one of the most common scam out there and their addresses are very similar.
forum.replica-watch.info
As for the "best" rep with the "best" movement, there's no such thing. If you do a bit of research (an appreciated and encouraged practice here at RWI) you'll find that there's a variety of different opinions for both matters. If you asked such a question in a single threads, you'd first be rigorously flamed, then you'd get x different opinions and no answer for yourself in the end. That is why the research is so important, YOU have to learn what is out there, how it works, what flaws it has and ultimately, with what you can live with. You're entitled to make question, but your starting one is very generic and the implicit lack of elaboration behind isn't well taken here.
For your resarch, you can use the research bar here, or, as I do, use google, adding "...site:forum.replica-watch.info" to your query and obtaining a ton of threads to read and learn from. (ALERT: NEVER use google to look for a TD, use ONLY RWI's links!)
Finally, that your previous rep broke in 6 months doesn't tell anything. That may also happen with the "best" rep, it's an intrinsic risk of this hobby. Would be interesting to know: which factory (was it a dj36?), what movement was inside? That could shed some light into the why it broke.
Now on your specific questions, I don`t have the answers, but an opinion. What I would do today is probably go for a GMF, but I'd do a bit of research first and maybe some specific questions to make sure what the state of the art is. I'd go for BP as well, already have good experience with BP, satisfactory quality for the money. Then, if possible, I'd go for a movement I can swap 1:1 with a gen ETA or Sellita if it craps out (A2824, A2836), or another chinese clone I can find on the net cheap. Not sure which DJ36 models are available with those movements though, maybe none. In that case I'd have to do more reseacrh on movements, because I'm not familiar enough with many others. But this is just MY opinion, there's for sure a bunch of other people who have an opposite one.
Good luck
