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Considering the fact that you're probably looking for compact dimensions and clear glass without an insane amount of magnification, I can recommend the Sightron S1. Would be a great scope to sight in at 50 yds and forget about.

http://www.midwayusa.com/product/14...-scope-3-9x-32mm-fine-crosshair-reticle-matte

There are a TON of options out there though, and $150 won't buy a top of the line scope, so you might want to list your priorities. Do you want max glass quality, or easy adjustment (turrets) or a specific magnification, or the lightest scope possible? Just some thoughts.

 

Well, then I still vote the Sightron.

This fixed 4x would be a good choice too. For a takedown scope, it would be nice and compact. Plus fixed power = more durability, since there are fewer lenses to go through and fewer thins to break. Weaver glass is good too.

http://www.midwayusa.com/product/36...fire-rifle-scope-4x-28mm-dual-x-reticle-matte

If you want to go cheap for a while, the Simmons 22 Mag line is OK for the $40 they cost. This one gets you an AO and turrets.

http://www.midwayusa.com/product/26...le-objective-truplex-reticle-matte-with-rings

 

I recommend a bushnell elite 3200 10x fixed

http://www.midwayusa.com/product/95...mm-1-10-mil-adjustments-mil-dot-reticle-matte

it'll give you more vertical and horizontal adjustment out of it. Better optical clarity