I'm in the minority - I prefer Fiskars cutters. They're not readily available here so I had to order from the US. I have 60mm, 45mm 28mm (for cutting curves) and even 18mm, which I use for cutting applique shapes.
The Olfa Ergonomic I bought when I first started quilting I keep for trimming batting etc. (more for the fact that I don't want to dull my other blades than because I like it).
I also use an Omnigrid mat. Most of my rulers are Omnigrid - made sense to me to buy the same brand of mat. I've had my big one three years - not a mark on it.
Happy quilting
