For those of you looking for the depth and sheen only achieved with oil-based paints, but are a little hesitant to try, Rustoleum makes a great pre-mixed product sold at most hardware stores. It's a great place to start and comes in several basic colors.
My first "oil" project was the sideboard in my dining room. It took less than a quart of paint and a half a dozen foam brushes. Cleaning paint brushes when using oil paint is such a pain, I try to use foam brushes whenever I can. Keep in mind that oil paint takes much longer to dry than latex so it drags out painting projects quite a bit, but in the end it's worth it.
If you're feeling a little more adventurous and want to have your own oil mixed, Benjamin Moore makes a great product: Impervo Alkyd High-Gloss Enamel.
Also, as solvent paint products become more "green" they tend to not self-level as well or go on as smoothly, this creates more noticeable brush or roller marks. To reduce this a little paint thinner or Penetrol can be added and mixed with the product.