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I've been using Holosun sights on my "frig around" guns (i.e. not used for competition or anything serious) and have had good luck with the two that I've owned. I like Micro-sized sights on the Vector to keep weight down but Aimpoint Micros are getting crazy expensive for me to use on all my guns. I used a Trijicon RMR on an earlier Vector I owned and really liked it but with mount and sight it easily turns into a $700-$800 solution.
I have a Kriss Gen 2 in 45 acp and I use the vortex sparc 2 (319$ with Multi-height mount system and 2 batteries included)... I love it! Also I use the TRS-25 bushnell on my CX4 in 9mm (150$)....Another great option as well. Can't ask for more at that price.
EO is in the middle of a bad scene they're paying back customers due to defects (sight not holding zero) If you like that look maybe try a Meprolight, they're very solid (Israeli issue) and a decent price, also Wolverine imports them so no issues on that end. If you like really small sights the Shield CQB is a solid unit (British issue).