Tony, congratulations on getting a Tyros.
I've got the TravelStar 20Gb installed in my Tyros and it's been working flawlessly for over 2 years. As far as external PA speakers, I only STRESS that you go out stereo, and not mix-down to a single mono speaker output. Many of Yamaha's sounds (especially acoustic Grand Piano) rely on stereo imaging, and will sound TERRIBLE (tinny thin) if you attempt to mix it down to mono. For a compact one piece PA package which has 2 speakers (stereos) built in I recommend Motion Sound Keypro amps:
http://www.motion-sound.com/keypro_amps.htm I own the KP-100S and have been very satified with its performance for smaller rooms.
I'm not sure if/when Tyros2 is being released, but I hope you get yours well before then, because I assume once 2 hits the streets, Tyros1 prices will drop dramatically.
As one of the very first (perhaps 'the 1st') Tyros owners on SZ, I find it interesting how popular this keyboard remains, especially because when I purchased mine (Nov 2003) there was a lot of negative bashing going on here about it by several SZ members. I've loved my Tyros since the day I purchased it, but felt beseiged with negative comments by some here for purchasing this keyboard, calling it a 'mute' slab with cheesily constructed small (toy) keys. It appears 2-1/2 years later, I've proved them wrong, as I continue to really enjoy playing my Tyros. My Tyros continues to deliver performance satisfaction.
Tony, I'm confident you're going to really enjoy your Tyros too.
Scott