Not to destroy any high hopes... but focusing with AF lenses is rather a painful thing, unless you invest in lenses with USM focusing motor (which will stretch your budget even more). If you want to explore manual focusing I'd recommend a fully manual lens, e.g. Carl Zeiss lenses. There are older Contax CZ lenses that require only an adapter. No need to get the newer Zeiss lenses with Canon mount.
But maybe you focus on the basics first, like exposure and composition. Let the camera do the focusing, it's fast and reliable. And for camwhoring it's a must :bsmilie: