Another vote for CZ: they are very accurate and come with great factory sights. You should also look at new or used Marlin bolts, which are also very accurate and far less expensive. You can buy good quality after market aperture sights for many .22 rifles from Tech-Sight - I have them on my Marlin 60 and they are great.
Speaking of semi-automatics, you may want to look at the Marlin 60 or 795. They are very inexpensive, accurate and they function reliably.