Second hand beginner irons? | Golf Monthly

A little more info. I was offered a set of Callaways so said I would have them on condition I got my swing speed measured etc to make sure they were suitable for me. After taking the clubs into American golf discount, it turns out the whole set is fake!
Very good Chinese copies apparently. Also my swing speed wasn't suitable for the graphite shafts, so they're going back to my friends dad post haste.

While I was there I tried some burner 2.0 irons and ping g20's. I hit both straight, but the burners were going further. Since found out this was becuase they are using less loft now to make you think you're hitting further. I did like the pings but i couldn't bring myself to spend £376 on a set of irons whe I've only just started.

So, If I get some second hand G10's (I'm guessing the higher the number the better the club?) What colour dot do I need to go for?