I have for myself a 2X scope is good for indoor spots and 3-D. A scope I used to use a lot years ago indoors was the Gold Scope which has a black dot. This worked really well indoors but was not the best for 3-D. My current scope is the InterDot which is a fiber optic scope which I use mostly for 3-D.

a lot of comapanies make good scopes. They can range anywhere from around $40.00 - $350.00. Some good brands to check out are Sure-Lock, Toxonics, Beiter, and Golden Key.

Lancaster Archery has a wide assortment of them and will help you any way they can to match the right scope to your style of shooting. As with anything else you will find a couple that you like much better than others.