Newbie here - pellet pistol repeater recommendation?

Hi Everyone, I’m new to the air gun world and am looking to purchase a good pellet repeater pistol. I bought a sig sauer p226 (not the x-five) and generally like it, but it eats co2 and the shots lose velocity very quickly. I have a 9mm at home and use the pellet gun for target practice in the garage between range visits. 

Heres what I’m looking for: 
-Quality pistol. Let’s call it $250 max but willing to pay more for a quality pistol
-Picattiny rail highly preferred. I occasionally use the weapon light from my 9mm to shoot in the dark
-Similarly styled to a powder firearm.
-Repeater-Shoots just pellets, or pellets & bb’s (I will be shooting metal targets)
-Consistent shot velocity, as good as I can get it at least.- Not a revolver-Blowback preferred but definitely not necessary. Would rather have consistent shot velocity
- The more shots per magazine the better 

Thank you in advance for any suggestions!
 
I have 5 pistols and my favorite is either Tanfoglio Limited Custom or Tanfoglio Gold Custom. The limited is as accurate as they get at 25 feet and the Gold with a red dot scope equally as well. Get feel and realism. I use to primarily train on small metal gong targets and move as I shoot as I would with my real guns. For about $100.00 either is a winner.
 
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Her are some fine Blow Back .177 cal pellet pistol by Sig Sauer M17