your link doesn't really work but im guessing you have the Dell 2208WFP?
If thats the case, then you would need a new monitor to output a full HD picture.
Full HD is 1920x1080 while your monitor is only 1680x1050
I recommend the Dell U2311H. Its 1920x1080 and features an e-IPS panel which offers better color and view angles than typical TN panels. Its basically the best value you can get for this kind of quality.