Although you haven’t mentioned a budget you should have the luxury of been able to avoid performance and evolution series ones and be solely looking at Factory series ones.
If you can I’d try and avoid the flexi 32s and aim for some less flexi 34s, even if you have to reduce the travel internally yourself to your required 140mm. Although if you’ve looking for a straight steerer this will rule out 34s.
I’d be picking some Floats, the Talas ones always seem to be a compromise on performance to me.
Most importantly make sure you find a pair that have been looked after and since you’re buying second hand I’d be keeping a bit of money aside to get them serviced.
You should be able to find some 26″ 2013 Factory Floats with a FIT cartridge for around £200, a bit more for some in exceptional condition. Older forks for less.