Baliboy, your very new to synthesizer/keyboards, and the basics of XG, and Floppies!etc (must have a floppy?!) - and the last keyboard I would recommend for an amateur, would be something like a Korg Triton. or a Va7 for example.

The Yamaha 740 is the first keyboard that springs to mind, but since you have a budget (a wide ranging one it has to be said!) of up to $1,300, then think more Roland EM2000, Technics KN5000, Yamaha Psr 8000. and some korg models.

Basically your an amateur, so You don't need a high performance device you say, so leave the Triton, and go for a Keyboard like one of the above, and then add a budget sampler like the Yamaha ("SU models"), and you can get some great sounds there.!

EM2000 $1,100, yamaha Sampler, £200-300 = about $100 or so over your maximum budget. But if you want to experiment, and like XG voices, then try the PSR 740, although the EM2000 by Roland is a better keyboard (Personal taste).

The choice is wide!