like dude1234 says without knowing your price range its not possible to reccomend a processor, but ive reccomended one that will be more then suffice for the job
Intel Pentium D 830 Smithfield 800MHz FSB LGA 775 for around $260
I'd reccomend this processor cause its got a good clock speed, decent price, and it's dual core. It'll last you a while, and my brother has it in his new build. He mainly does graphics and web designs, and it handles those tasks with ease.
All good choices, a price range would make this easier. And i would definitly reccomend going for a dual core over a single.