i debated with this exact thing. After much research, i decided to go for an aluminum one. Actually, i just finished installing it (look at my gallery). When i ordered mine, i was off on my measurements by about 2 inches. So i had to order a new tank from Alloy Metal Works (Phil is the best, google their info). So, if you decide you want aluminum, i have tons of knowledge and a brand new tank i can sell you for $200 plus shipping I am in SC). I can send you the measurements if you are interested. Good luck.
