No need to buy a new monitor. In fact if your current monitor is a high quality model (i.e. Trinitron, Diamdtron), it will outshine any LCD. You will just use the DVI->D-Sub convertor and you will be fine. You may not even have to use a convertor (given with the graphics card in any case) if the 7300 has a D-Sub output, which I think it does.
You gor a pretty powerful processor there but a weak VGA. If you intend on playing games you better get yourself something better than a 7300 even if you have to buy a cheaper CPU. The GPU is almost always the gaming bottleneck culprit.
thanks dude! i'll just save money again for a new graphic card..i've already bought my new system. maybe 2 months from now i'll buy a new graphic card..thanks dude! atleast i didn't buy a new monitor. hehe..