Check out Crosman's web-site. Under the "Airguns" drop down is the "Custom Shop". The 2400KT shoulder stocked carbine makes a great practice shooter. Yes, it is CO2 powered, but you get about 50-60 shots a 12 gram cartridge. Shooting cost is not an issue. This makes a great 10 meter wad cutter pellet shooter (indoor practice on challenging Olympic targets) for trigger time. You don't need 25 yards. Or you can shoot outdoors with dome pellets (wad cutters are not accurate at longer distance) up to 25 yards in fair weather. The main downside is that CO2 is temperature senstive.
The Chinese QB78 family of CO2 rifles has many good options. These are fun shooters for around $100, depending on model.
Another great value option is a Mike Melick XS-12 rifle, $87 shipped. check out
http://flyingdragonairrifles.org/ This rifle is not temperature sensitive like CO2 rifles, and makes a nice economical accurate short range shooter.
If you step up to $170, the XS B-26 in 177 is a fantastic target rifle. This is a high quality clone of the Beeman R9 with a fantastic trigger.
http://flyingdragonairrifles.org/XISICO_XS-B26.html . I own one, and it is a great shooter. It's a little much (power wise) for targets, but great for longer distance shooting and pest control.
Be careful with Gamo spring rifles. The triggers are mediocre and need an aftermarket upgrade and tune to be good shooter. Most Crosman spring rifles are Chinese Gamo clones - same issues. The Stoeger family are essentially the same thing - Chinese clones of the same Gamo rifle, with a little better fit and finish, but still needful of a tune and trigger upgrade.
The Ruger Airhawk is a steal. It is a very nice Chinese clone of the RWS34 (internal parts interchangable) and is the same as the XS-B25, but in 177 caliber (The XS-B25 comes in 22). It has a great clone of the RWS T05 trigger, which is a fine trigger (RWS now come with a T06 trigger). But, just like the RWS34, it has a too long barrel subject to "barrel droop" that can be problematic for scope mounting without a droop compensating mount, depending on the sample you get.
The XS-B26 is a better rifle than the Airhawks/B25's for the money, even if it does cost a little more.