I've always stuck with handheld Korg tuners. They're rock steady and put up with lots of abuse. I bought a GA-30 tuner off eBay for less than $100.
It gives you all the features you'd ever need including transposing and 7 string.
My only complaint is there's no backlight for the LCD display so for live use or in front of a computer screen in a dark studio, it's kinda tricky to see the 'VU' meter sometimes. There's red & green indicators for flat/sharp tho.