I've owned two .22 Marauders over the years and they are great guns. Both my and my best friend's Marauders are heavily modified but were a great basic air rifle to work on and learn. I'm not sure if Crosman has improved their .22 barrels to be more consistently accurate but we both replaced them with LW barrels and they're very accurate. Awesome trigger.
But, another good friend just bought a .22 Avenger for $399 at a great air rifle store in Colville, WA. Last weekend we spent a few hours mounting the 3-12 scope, dropping the regulator down from 2600# to 1700# and taking out some hammer spring tension to make it smoother and easier to cock. We shot 8 different types of pellets and it shot all 4 types of Crosman pellets acceptably well but WOW, the JSB's shot awesome. We were shooting 10 shot groups at 50 yards and it's a real tack driver. 8 of the 10 JSB 18.1g pellets went through one ragged hole you could cover with a nickel. 2 were just outside that but we're not sure if there's something loose in the scope. This happened on another air rifle using this scope.
He then bought an orange AC/DC dual fan Vevor compressor for $165 off of AliExpress and it arrived in 4 days. Very neat little compressor. $24 scope mounts.
I'd recommend the UTG Classic 3-12x44 scope, not the compact or IR one. This scope is very good for the $100 cost and ranges well for a 12X scope.
These items would be just over $600.