Okay, so the majority of my SNG experience has been at the 60$ 45 player SNGs on Stars. This was a couple of years back before I left the US to do some travelling. $60 SNGs offer a good mix of serious novices, intermediates of all types and some pros. Would see some regular Supernovas in there. The play is tricky, but if you have a good understanding of the odds
and timed bluff strategies you can hang in there. Surprisingly, there are still very loose players at the 60SNG. I play in "bursts" (like 10 tourneys in 1 play period which lasts for a few days). I averaged a finish in-the-money about 40% of the time for every burst... and this was playing very tight right up until the bubble! So you can imagine the number of loose players there are.
After travelling and spending some money I decided to conserve some money and played the 27$ and 33$ SNGs. I found the 27 to be pretty loose. While travelling, I casually played a series of 7$ SNGs which were very loose indeed. I've realxed my style over the years to accommodate more starting hands, but turns out I have to be extremely tight in anything below the 33$ games to get to the final table. My best record still remains at the 60$ SNG level.
With all the information overload out there, it's easy to get lost. The best advise I could give is a basic one that Harrington and Sklansky state best, that is to adopt the style of play that is opposite to the table's style, over a space of a few rounds. With 7$ being so loose I can only imagine the wild play at the dime buy-ins.