GioaJack- The reason for "no lead bullets" is due to more variation in diameter, and the lube "gumming up" issue you mentioned.
Boxerglocker- For the XL-650- the Dillon unit will serve you well. It may take more time to setup initially, but it is designed to work well with the XL-650.
The powder cop is handy for long cases where you can't easily do a visual (think 4 grains of W231 in a 357 Magnum case!). It's very easy to setup, and you just have to make sure you don't forget to look at the indicator. The RCBS die is good, but on the XL-650 you'll have to unscrew the die if you want to "check a jam" to see if the level is indeed off (if the Lock-Out die locks up). Ironically, the RCBS Lock-Out die works best on the Hornady Lock-N-Load for this reason