How many engines?

Okay, a serious question here.  How many Cox engines should I keep?  I look around my workroom and see "stuff" everywhere.  It's seriously time for me to start weeding out and thinning down.  One obvious place to streamline is my Cox engine collection.  Actually, it's not so much a collection as a junk yard.  I have so many engines and engine parts that I will never use them.  I'm not a collector per se, I just see something and say, "I want it!"  I'm far from the most prolific Cox engine hoarder on the CEF, but I easily have 40-50 complete engines, and parts to build 20-25 more.  I'll never use them up in my lifetime.

So, how many should I keep and how many to liquidate?  I figure I need to keep:
One of each .15 size engine
One of each .09 size engine
One Queen Bee .074 engine
One R/C .09 and .05 engine (with actual carbs, not the rotating rings)
One TD .051
Two TD .049 engines
Two Medallion .049 engines
One of each general Bee engine (1 Black Widow, 1 Golden Bee, 1 Silver Bee, 1 QRC, 1 Texaco, etc.)
Three Babe Bee engines
Three Postage Stamp engines
Two Horseshoe Engines
One Spook engine
One Thermal Hopper
One Space Hopper
One Space Bug
One each Ranger/RC Bee/Dragonfly
Two Pee Wee engines
Three .020 product engines (because I like messing with them)
One Little Stinker .020 engine
Two TD .020 (because I have two)
Two TD .010 (one to run and one to keep NIB)
One Beaver engine
One Rhino engine
Accessories - I'll just keep what I have "just in case"

I think that about covers what I think would be a basic "need" list.  That still leaves me with plenty of engines to liquidate if I can bring myself to let them go.  What do Y'all think?

The "Fred Sanford" Mark