First, only you know the type of sound you like when listening to the music you like. That said, my advise would be to go slow, have a plan and keep things simple. 

The equipment you have now doesn't sound like a bad start, I would say to pick the piece of equipment that you need to change the most and start from there. If there is any kind of audio shop near you, listen to some different equipment to see what you like and go from there. 

Vanny, the specs you've provided would indicate the power CONSUMED by the Technics, so I'd guess it outputs ~ 30 "honest" Watts per channel.  I'd try for about 80 - 100 Watts per side to sound better with most speakers.  Check SP's Recommended Components for better speaker choices than the Bose.  I'd also suspect the Pro-Ject III would be an upgrade, but others can tell you with greater certainty.  Decent CD players have also come down in price, so again, check SP's semi-annual recommendations.  Good luck!