Economy Class seats - worth paying for extra legroom, more recline, or a row of 2 ?

[Doc Alan]

If you can, try to look the part with the following:
Smart conservative clothing (no ripped jeans or belly hanging out)
Tidy hair (not multi coloured spikey hair)
No facial piercings
No visible tattoos

Thanks for the advice Ian , I'll do my best
Thanks also to everyone else who posted so promptly
It's a Boeing 737-700, so I'll let you know my decision - and the cost .