I would agree with CS_TBL - don't spend money on a hardware synth - get a good midi controller keyboard and use virtual instruments. A midi controller keyboard doesn't have any sounds itself - it just sends midi information. There are many virtual instruments out there from the free/cheap to the more expensive like Steinbergs Virtual Guitarist 2,Virtual Pianist, Virtual Bassist and Groove Agent 3 for drums.
http://www.steinberg.net/157_1.html
Another route could be using an application like "Band In a Box" by PG Music that can generate backing tracks in many different styles to your own chord progressions (you can also create your own styles - all you then have to do is add your acoustic guitar and vocals etc. (No keyboard required)
http://www.pgmusic.com/
http://www.steinberg.net/157_1.html
Another route could be using an application like "Band In a Box" by PG Music that can generate backing tracks in many different styles to your own chord progressions (you can also create your own styles - all you then have to do is add your acoustic guitar and vocals etc. (No keyboard required)
http://www.pgmusic.com/