assuming you're like me, you might need a bigger pot as well. i only have a 16 qt (4 gal) pot. the amount of grain required will take up a lot of space that you don't have to account for when doing extract. i just watched my first all grain batch on sunday. i believe he used an 8 gal pot.
if you have the ability, see if there is someone in your area (possibly on this forum) that might be willing to let you see them do an all grain. people had told me how much more time consuming it was, but you really get a feel for it when you are there doing it.
this is not to discourage you, but to inform you. personally (this is MY opinion, so don't everybody get PO'd), I don't see myself doing all grain for a long time. it took us 7 hrs to brew approx five gallons. i recognize that it was not probably the most streamlined brewing process, but it gave me an idea of the time commitment required. for my inexperience, i don't think the time is worth it for me. i did learn a lot and will probably see how others go, but at this point in my brewing "career", it's not for me. however, if you do all grain and don't like it, you can always use that gear for extract and partial mash.