Morning Aquamaid,
Exciting times....new tank and fishy choosing
I would agree with Colin about the guppies, they do seem to just die suddenly for no apparent reason....I had some but haven't now for precisely that reason. I have heard the same for platys too, but speaking from my own experience, I bought 3 of the blue marbled ones when I first set my tank up, (about 18 or more months ago) and have had no real problems, (other than loads of babies, but that's another issue) and I only recently lost my last original one. As you say, the blue ones are very pretty.
I think you should definitely consider cories...no tank should be without them, I think
Again though, I would say , check which ones to go for as some need a more mature tank not a newly cycled one, but that isn't a problem in itself, as you just have to wait around about 6 months, and then....yay! joy oh joy! you can go fishy shopping again
They are also better in shoals of 6, they will act completely differently and you would really see their character....and they have plenty of that! Also, they prefer to be in shoals of each kind rather than 2 of this cory, 2 of that etc...did that make sense?
I would avoid the dwarf gouramis (Colisa Lalia) as they too are prone to an incurable disease, which happens from nowhere, and will kill the fish...slowly. Not nice, been there...done that too
However, I think I'm right in saying that you wouldn't run this risk with Honey Gouramis, but Sue will tell you for sure.
Meanwhile though, have loads of fun choosing and go and see lots of fishies in the shops, and make sure that you're happy with the shop you will be using. If their stock look healthy etc. Bear in mind that often the fish in the shops don't always show their colours very well as they may be stressed or young, but will bloom once they're settled in a lovely new home.
Happy fishing!