I can’t really speak on what a good hud would be for exclusively SNGS but my MTT hud is as follows (HM2):

Name / Total Hands / Big Blinds

TOT VPIP / TOT PFR / TOT 3BET / TOT 4BET (Raise 3BET) / TOT FOLD TO 4 BET

Flop CBet / Turn CBet / Flop Fold to CBet / Turn Fold to CBet / TOT Steal / TOT RFI (Raise first in)

When I put my mouse of TOT Steal the pop up shows all different steal stats.  I mostly check for fold to steal from BT and CO and how often they fold their SB or BB.  RFI is a stat I could use a little direction on.  

I color coded VPIP and PFR less than 15% is red, between 15 and 30 yellow, and 30+ green.

I’m open for constructive criticism on my hud as well.  I think this is a good starting point if you don’t know what to put on.  If you’re new you can drop RFI and the 4 bet stats which are only really reliable if you have a lot of hands on someone.  

Also check out some one Marc Alioto’s videos.  He’s a hud junkie and you can learn a lot on how to properly use them.  Hope this helped.  Message me or reply here if you have any other questions.