I'll take a stab at it (no pun intended...) since you became a supporting member - good job!
The 9050SBT - between 150-200
The 5780 Applegate - they are still available today for around 100 - so yours might be worth more as an older collectible -
The 2550 - available today new for $185 -
The 3550BT - Mel Pardue teflon auto - they sold for just over 100 new, but have not been available for a while as far as I can tell - might be worth doing some research to get the best price on this one -
The 145 Nimravus fixed - $150-240 on the bay -
The 705 McHenry - $150 ish - can't find much on these for sale today...but it is a nice axis lock Benchmade...
The 310as - one sold for $200 in Feb 2015 on Ebay -
The 3100 Benchmite - here is a thread on these - could not find any sales of them
http://www.bladeforums.com/forums/showthread.php/1294278-Benchmade-Auto-Benchmite-3100-worth
The 42 is well covered above - the prices on these rose after the movie "kick ass" where it was featured - $400-$450 is around where I have seen these going in mint condition - probably the prize of your collection.
the 1570ST Avalanche - 80-100, maybe a little more
The C35SBK - around $175-$200
I missed a couple, but you get the idea - take you model number, search google, and do a little extrapolating -
Since you are now a gold member (thanks!) you can post a for sale thread - start a little higher and then work down your prices until they sell -
The folks here will not let you sell something too cheaply, as someone will want what you have - as long as you don't get in a hurry....
Best regards -
mqqn