Hi sly.....
There sure are a lot of products out there....some certainly are better than others. I think you have to try a few to find which one you like best...at a good price.
I use "Sunshine" mostly. I use a #3 or a #4 for my
seed starting....but there is also an all purpose one that seems good for repotting.
Keep in mind that you can make your own....or even just add organic matter to lighten the mix you already have. (I do that a lot....with bargin bags)
A simple mix for
seed starting can be like this...(really good drainage)
seed Starting
4 parts peat
2 parts perlite
2 parts vermiculite