new bag that wont fail!

I have the Computrekker also. Although it is built well, I found it too heavy when full and use it mainly to store my gear. I now use a Kata R102 which is slightly smaller but feels more solid and balances better for me. It holds less but will handle the D200, 70-200VR and maybe 2 more lenses as well as an SB800 and some accessories.

 

Johan...
I don't know if this will work for you weight wise, but have you tried
reversing your D200 with 105vr to the bottom of the bag instead of
to the top. It might fit better with the weight more evenly carried.

This is only MO. I have the trekker classic which is much smaller, but we have two cameras mounted with lenses, the d200 and the 300f4, and the d70s mounted with one of three other lenses the largest being the 70-300. Bag then carries two other lenses and plus stuff.

 

Another vote for a Kata backpack here. I have the R103 but if you are worried if it will hold everything you might want check out the 207. There was one for sale in the "For sale" section. It is gone but you can still see some nice photos of the 207 here.

 

Hmm... I think part of your problem is configuration. I have the Naturetrekker AW II which is similar in size and setup to the Computrekker and can fit a considerable amount (including 70-200 with hood ON!). I keep my cell phone on my person or in a padded crumpler case that attaches to the backpack.

See below:

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I have a Lowe computrekker but use it as the mother ship. I off load
the gear that I think I will need to a much smaller bag and go from there.
The mother ship offers security and selection and the satellite bag
enables me to be fast and light. Makes you improvise if you load up the
'wrong' lens though.

 

You should take the geer you want to carry, to a camer shop and try out several bags. As for the cell phone, my suggestion is a Mountaineer cellphone case, it will wrap around one of your shoulder straps.