Micco,
I am from Finland and I have a Tyros in my studio too.

I read that you are interested in a synth. I would not choose the Korg Triton Extreme, Oasys or Karma. I have a Korg Trinity myself and what I like the most about it is the user interface and the edit features. However, I have always thought that Korg cannot make good sounds in every sound category. For instance the pianos, especially the accoustic pianos in the Korg Trinity are very bad... If I would go for a Korg today I would probably choose the Korg PA1-X, but today I wouldn't choose a Korg.
When it comes to sound quality you need to be aware of the current trends. Within the upcoming 10 years softsynths will be all over the place. I have NI Elektrik Piano and I was really chocked about how good it sounded when I first heard it! The price is 199 euro, compare it with a stomp box for a guitar...

It is only a matter of time before softsynths sampled at 192KHz@24 are becoming a standard. Companies like Native Instruments and EastWest are going to come out with killer packages that really blow away the competition completely. With a Laptop and a firwire audio interface you can do any gig you like too with the power of a computer.