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Depends what youre shooting and at what range, but the Burris Droptine Rimfire 3-9x40 is a great option for a little more reach. For a red dot, the TRS25 would work fine.
I'm a big Vortex fan, they recently introduced the 'Triumph' red dot at $159.00 Canadian. Shake awake and life time warranty. Comes with both high and low mounts.