This is not in any order of preferance but what i look for in an astro turf is:
#Looks like real grass.look at the pitches in the U-17 championships in peru.it has the appearance of burnt grass cos of the blazzing sun....good idea.
#good bounce of the ball.
#Grass doesnt rip th eknees of you when you tackle.
BTW you would be better off getting mondo-turf.it is what is now used.It is design for soccer whereas astro turf was originaly meant for hockey.