Thanks for the help! I went and took a look at what you've suggested...
The Falken seems to be a bit of a standard tyre? An "A good All Season" tyre I often read it described as, was maybe looking for a bit better?
The T1R's aren't listed on Toyo's website as coming in 195/55R15, but sometimes they're still available at stores possibly? If not, they do have 205/50R15. These tyres seem to get pretty rave reviews.
The Hankook were a bit harder to find reviews on, seemed a bit of a mixed bag. Some drivers said poor, some said great.
I have always been told that mixing tyres almost always ends up in bad combinations. I imagine different treads, different grip profiles etc could mess things up? I don't -actually- know though. Glad to hear they're working out for you though, I'll have to research it a bit more to understand!
How much are the tyres you've mentioned if you remember/know off the top of your head? It's tough to find prices just via the web and would love a ball park figure to start off on.