Nikon is a great optic. I personally *LOVE* BARSKA optics for the price. Especially the ones with the illuminated center reticles. They are etched reticles and are very clear for the price!
I have a 10-40X50 Tasco world class on my ruger 10/22 TNZ and I can shoot the hairs off the mites on a fly's ass at 50 yards with it...
My only negative comment with the above mentioned centerpoints... is the metal wire crosshair. I am much more fond of an etched reticle for durability and less chance of tweak or breakage.
I also would recommend MILLET optics as well. a VERY good optic for the money.
I also have BSA optics on several rifles as well. They are also a very good optic for the price. I would pick barska over BSA... bot BOTH have served me well over the years. I have Barskas on everything from 17 up to 50 BMG, and BSA's on several 17's. A millet on my Savage model 12 in 204 Ruger, and Nikon's on my 243, 30-06 and Remington 1187 rifled slug gun.
Remember... we are not shooting long ranges with our 22's here. you don't need super accurate repeatability as chances are you are not shooting at ranges that will require you to be turning the adjustment knobs all the time. The above mentioned optics are all clear and bright, and give very good light transmission for an inexpensive price. They tend to hold zero very well, and certainly will withstand the bone jarring recoil forces of the 22 long rifle round...
Buy the optic you like, with the features you like, in the magnification you like, with the biggest objective you can fit on your rifle. if you need higher rings... go for it... just keep the front bell as close to the barrel as you can when mounting.