Hi! As an Italian bespoke shirts company we generally recommend to go with a button down collar (to be worn without a tie), but I must say it depends on what is your style, what are your tastes etc. Here you can find a picture of a linen button down collar shirt:
http://www.neronote.com/nn/en/p/white-linen-shirt.3sp
Our customers really appreciate linen spread collar shirts, please have a look at this one:
http://www.neronote.com/nn/en/p/light_blue_linen_shirt_white_contrast.3sp
We've also manufactured cutaway collars for customers who preferred a very spread collar (it's not shown on our website but we can make it:)