Not sure what I want for an air rifle

[Bullit]

Yes, they DO have more "bark" for sure, vs pneumatic.

[Plekto]

You can also get a 2300 Carbine via the Crosman custom shop.  Get the 10.1 match barrel.  $130, give or take.

Get a mutil-shot riser and breech, plus a shroud (note, this is not a "brake") for the barrel, essentially turning it into a Marauder pistol that uses 12 gram cartridges.

http://www.airgunsbbguns.com/cobra_venom_co2_Pistol_p/venom-2240.htm
The pistol itself is out of stock, but the parts to make one yourself are available.  The problem I have with the Marauder is that it's simply too expensive - there should be a cheaper CO2 based version available as well.