With virtually every company across the country now offering some type of retirement plan there are bound to be some really good ones and some real stinkers. The funny thing is that it really doesn't take much to make the 401(k) plan your company offers a good one and a good plan can make it that much easier to achieve the retirement that you want.If your 401(k) plan has most of these attributes, you're in good shape.Low costsOne of the easiest ways to improve the return on your investments is not by trying to pick the best performing stocks or mutual funds out there. It's picking the ones with the lowest costs. Expenses cut directly into the amount that goes into your pocket so lower expenses mean more money for you. Look for mutual funds with an expense ratio of 1% or less. Index funds s