As far as sights go, you have plenty of options. Each company offers sights in every price range. It isn't inconcievable for you to purchase a decent quality sight (something bright and durable) for around $50.

My suggestion would be to go visit your local shop and talk to one of the employees about what makes the sights they carry worthwhile. They'll be able to set you up with something in whatever price range you feel comfortable spending.

The same can be said about rests, actually. You can purchase a decent quality fall-away rest for at or around $50.

Good luck!