What filter would you recommend for ‘general use’?

If you are going to keep the filter on at all times to protect the lens, we suggest you get the Tiffen UV Protector, which provides basic UV reduction as well. It will reduce the excess bluishness in images shot at high altitudes, of distant scenes, or when shooting over water. The Tiffen Sky 1-A filter is also suitable for this purpose and many photographers leave it on the lens at all times. It absorbs almost half the UV and is pink-tinted to add a touch of warmth. It generally produces more pleasing skin tones when shooting outdoors in open shade or on overcast days. In short, either filter will suit your purpose and the choice really depends upon whether you want a touch of extra warmth or not. Of course, you can also get both filters and tailor your choice to your requirements and shooting conditions.