i really like my new 27 but the bad thing is i have to buy new night sights. i have been using xs big dot 24/7 on my 23 and s&w 640. i have found they work great for these old tired eyes, day or night. but another 100.00 + is just hard to do. my 27 will be carried more than the others so i can justify the cost, but i was thinking, is there another sight that cost less that i should look at? i thought of keeping the stock sights but i know the big dot would surely make a difference in a defense situation.