Hi ReneT:
Congratulations
and welcome to the Tyros club.
I own, use, & recommend the Kaces Porter III, model #KKP9KB case which includes built in wheels (44.5" x 17" x 6.5"):
http://www.aceproducts.com/porter.html The KKP9KB's interior length & width dimensions closely match the Tyros . The kb case thickness is about 2" thicker than the kb, so I use a piece of 2" thick foam, cut to the same dimensions as the case interior, which offers additional padded protection to the top of the kb (keys, buttons & screen) as well keeps the keyboard from moving around in the case. The Kaces Porter Kase is perfect for daily gig transport as it's both lightweight yet provides adequately padded protection. I find the Tyros & Kaces Porter KKP9KV a terrific lightweight combo. I got mine for $99 at the Guitar Center here in the US.
Scott