I went through this earlier this year. I purchased the Hornady LNL progressive press after reading
http://www.comrace.ca/cmfiles/dillon...Comparison.pdf
The clincher was that Hornady is offering 1000 bullets with the purchase of the LNL press. It's a great press and makes very accurate ammo.
Hornady and Dillon both offer the same warranty and excellent service.
Hope this helps