MVE SC 20/20. Or XC Millenium. The Millenium is cheaper and the No 1 seller but for another $100, the MVE SC 20/20 has a thicker aluminum hull. Notice the weight difference. That translates to more durability and less likely to develop a leak. The semen company who you do most of your business with will fill it with nitrogen during his delivery visit. I just had my visit today from Select Sires. You can still get semen from other vendors but I like to have a primary vendor. My firld agent is Kenley Conner. What a great guy. Even gives you free advice. :lol: I am serious, he is a great guy!