which shop can you guys recommend for me to have a look at all these things ?

french door usually won't be affordable, how much did u pay for it?

if its a 900x2100 tempered gls door with timber frame, 1.2k is cheap

thatz a very good deal...

how thick is the glazed glass?

solid door prices vary depend on the size, model, grade, wood species, accessories use and also grade.

before u start to enquire bout range u need to measure your own house actual door size each one of them that you intend to change otherwise its very hard to give estimation as standard size door prices differ a lot from special size door prices and the model n type of wood as well as grade n thickness of door panel n the door itself affect the price as well. Remember to check whether your house door frame is metal or wood type,if its metal type then you will have problem of hanging those door with triple glazed tempered glass door as they are very heavy and the factory fitted hinges can't hold the weight. The door might one day collaspe and cause accident becos those door are somewhere between 60-120kg depend whether its single or double door aka double equal leafs door. 

nowadays developer goes for cost cutting n cheap skate method, they will install al-cheapo metal frame for your front door. Its not for your benefit of preventing termite, its more to looking after their profit margin and make their installation job easier compare to a wooden door frame.

Usually those lock some are for thicker door like 1 1/2" which is extremely expensive n need to special order with factory, most shop will not keep spare door for it.