How do you decide between 401-k plans, Roth IRAs, and so on? It's a common question. Where Should My Money Go (from the online Motley Fool website) give a brief summary of the best choices. In order, they are:
Any plans (i.e. 401-k) where your employer matches your contribution
Roth IRA (if you qualify)
Employer plans where the employer doesn't match
For the logic behind these choices, click here to read the whole article.