Have you heard of the "age 55" rule?  If you anticpate needing money from you retirement plan prior to age 59 1/2 you might not want to do a rollover into an IRA. Kiplinger.com explains the age 55 rule.

If you are at least 55 in the year you leave your job, you may be able to withdraw money from your 401(k) at any time without penalty. But if you roll the money over into an IRA, you're generally hit with a 10% early withdrawal penalty if you touch the cash before age 59½.