What I have isn't very popular with a lot of people because UTG gets bashed a lot. But it has served me well and has kept zero no problem.
http://www.amazon.com/UTG-5th-3-9X50...9411305&sr=1-1
It is an illuminated mill dot and comes with a sun shade and flip up covers so its an excellent value for the price. It is really big with the shade on, but looks great on the rifle proportion wise.
Whatever scope you get many people suggest a one piece mount for the rings like this
http://www.amazon.com/UTG-Airgun-Pro...ef=pd_sim_sg_3
Just make sure to get the height and tube size you need
And here are some preemptive strike links:
http://www.rimfirecentral.com/forums...play.php?f=217
Target Trigger and Metal Guard
http://www.diproductsinc.com/Detail....56299&CAT=3603
Bipod
http://www.amazon.com/UTG-TACTICAL-A...9411895&sr=1-1
Magazine Safty Removal Mod
http://www.calguns.net/calgunforum/s...&postcount=894