Selecting board-to-board connectors

[msr]

Hello,

Im designing a sensor's platform based on a stacked design, so I have two boards which I have to connect trough a board-to-board connector.
I already spent dozens of hours trying to select the most appropriate connector but Im still not sure.
Some specs Im looking for:
- small (about 1cm on the wider side)
- should provide a solid connection (a "click" sound)
- 15~20 pins, 2 rows
- stack height = 5~6mm
- polarized

My first choice was this (from FCI):
20021221-00012C4LF
20021321-00012C4LF

But they have only 12pin (pitch=1,27mm) and don't provide a solid connection.

Then I tried some Hirose DF9 series but the stack height is < 5mm.
Now Im using FCI Conan series (pitch = 1mm, 15pins):
91910-21415LF
91930-21115LF

These fit really well, but now Im worried about their availability.
Im in Europe so my prefered distributors are Mouser and Farnell. But just Mouser keeps stock of these connectors and the current stock is ~500 or less. So, I guess if I want to make >250 boards I will get a problem, taking into account that each board has 2 connectors.

So, I would like to ask you two questions:
1 ) Based on the specs above, could you suggest me a good board to board connector? (which has good availability)
2 ) What is the common practice on buying and maintaining connectors stock (from a commercial standpoint)? I guess relying on distributors is not safe.

Thanks in advance for your help!

[sacherjj]

Are you holding the boards together by any other means, or relying on the connectors?

[msr]

Are you holding the boards together by any other means, or relying on the connectors?

Im just relying on the connectors. The maximum number of stacked boards is TWO and they are very lightweight (PCB thickness = 0.6~0.8mm), measuring 45x25mm.

[Smokey]

Check out Samtec. 
http://www.samtec.com/
They are great for all kinds of board-board connectors.  You won't usually find them at distributors since they sort of make everything custom when you order it, but they are really good about providing samples and their lead times are usually really good.
Check out their board-board connector selector wizard.  You give it your parameters and it tells you the appropriate part numbers.  Super handy.
http://www.samtec.com/search/board_stacking.aspx 

[AndyC_772]

The person you need to speak to is Jim at Toby Electronics:

http://www.toby.co.uk/

[Psi]

If it's any help, here's how i mounted a button+led PCB vertically on to the main PCB for one of my projects.

It's an 8x2  2.54mm pitch right angle header.
But it's not removable without unsoldering.