Hi:
Just my 2 cents but I love my Crosman 1760. Lightweight, cheap, takes only 1 cartrige, loves Walmart Diasys, and is very accurate. It's a reliable and accurate shooter right out of the box. No fiddling or mods required.
It has the same action as the 2240 pistol and all the upgrades and mods will work here as well. Sadly they now only offer the 22 cal version, the 2260, at the el cheapo price - around $75 (use the Pyramid 10% code and get it for even less). The currently available 1760SE has the steel breach and a scope and goes for aroung $175 - too rich for my blood. On the good side, the 22 version makes better use of CO2 and is better for pest control.
You can change it over to a 177 but you will need a 177 bolt and barrel from Crossman - about $25 including shipping if memory serves. Might as well do the icemaker transfer tube as well if you have it apart.
I modded the trigger with the two set screws to shorten travel, provide an overtravel stop and added a 3rd screw behind the trgger spring to make the trigger weight adjustable as well - total cost about $1.50, same as a cup of coffee unless you go to Mickey D's and get the senior coffee as I do. Trigger is now light, short and predictable.
If you want to, you can add a steel beach and scope it or add a Daisy rear peep sight. I went that route and modified the front sight by placing a small washer into a slot in the blade. The hole in the washer is just the right size to trap a standard target bullseye at 40', the distance to my fence from the patio. Choose you washer accordingly - you can find small washers at most hobby shops.
If you want to, you can do all the wild and hairy mods as done to the 2240 on the Crossman site, new valve, power adjuster, HDD, trigger/sear insert, go to HPA etc., etc. Never ending fun til the cash runs out!
Cheers,
Fatman