You mention fixing the old rifle. Are you aware you can get almost all the parts for a number of old Crosman guns?
https://support.crosman.com/hc/en-us/ca ... s-Diagrams
Download the parts diagram for the model you have, check out the part numbers for the offending part(s), order from Crosman. Most parts are quite inexpensive. I believe they still charge a flat $4 shipping/handling fee so make sure you order everything you might possibly need to fix it up.
No CO2, eh... (just had a blast introducing some new shooters to the joys of the Crosman 2240 single shot pistol)
Give the Ruger Airhawk a good look. It's a copy of the Diana 34 which is a marvelous piece of ordnance. The Ruger can be slicked up somewhat and turned into a really nice shooter.
Another option is go with Flying Dragon Air Rifles. Mike's got a great rep on the airgun forums for a stand up guy to deal with.
http://flyingdragonairrifles.org/index. ... duct_id=67
That's basically the same rifle as the Ruger Airhawk, but produced by Xisco and sold by Flying Dragon. If you can afford the price, buy it and get the full tune by Mike, you'll have a marvelous shooter indeed. Or you might prefer one of the other versions of the XS25 on the site.
Another current option (if you jump on it quick) is the Diana 34P being sold in .177 caliber by Cabelas for $150.
https://www.cabelas.com/catalog/product ... Id=1979675
Sever guys on the GTA forum have bought one of these rifle from this vendor and they are tickled pink.