The cell phone stuck out to me as well. I would look into some other option when the contract is up. I'm not sure of your useage, but this is what we did. DH never uses his cell phone, he just isn't a phone person. We feel that its important for him to have in case of emergency. So, we purchased him a virgin mobile phone and have the automatic re-up of $15 every 3 months so his number stays the same. I am a phone user (mostly for work) so I have a regular plan which ends up being cheaper then both of us having a "plan" type of cell phone.
As far as groceries, I saw the budget and thought, wow that is really good, I wonder how she does it. I'd say we spend around $500 per month on groceries for a family of 3. DH and I were talking about how we could get it to your level and we could just can't figure it out.
I say bravo on the cable price. Our cable service doesn't even offer anything that low. We have our phone, internet and cable bundled into one and we pay like $115 per month. We don't have movie channels but do have the extended basic and a HD converter & cable modem that they tack on extra.
The only other high item I saw was the electric. I'm not sure if you've done things to help conserve, like a blanket for your water heater, an adjustable thermastat, etc. to help lower that. With that being said, our electric bill is $135 per month but we rent, so home improvements are not where its at for us. We do lower the heat when we are out and at night. We also buy some putty stuff to put in the windows to help keep the draft out. Our cellings are 15 feet high everywhere except the kitchen. Our windows are 10 feet high in the living room and my son's room and weren't built the greatest, so that is why we try to use the putty.
I have to agree with PP when you consider a budget, throw in the categories of savings funds too. Its also helpful to make sure the money is automatically transferred into the savings accounts and vow never to touch it unless it is an absolute emergency.
I'm not sure if you have consolidated your student loans or what rate you have. We have student loans too, but have decided not to pay them off early. They are locked in at an incredibly low interest rate (3.75%) which is lower then a mortgage will ever be and less then what we get in our money market (4.125) plus we get to write it off on our taxes. It makes financial sense for us to put our money elsewhere. I'd check into it.
Overall I think you are doing a great job!!!