K&P suggested Mastiff (Bull or not bull) - what is the difference with the Neo?I have only scanned the thread so forgive me if I'm repeating stuff.
If you like more size an Amstaff would seem more suited, and more likely to be available (as a healthy individual) in blue if you have our heart set on one colour. Be very cautious though, if you want an Amstaff, taking the time to find one with ANKC registration papers is a very, very worthwhile investment.
This will give you recourse from legislation that resticts Pits, and sould you ever need to travel to Vic, could save your dog's life. Even in NSW, not having to deal with the laws around Pits is a huge advantage and can save much heartbreak and $$. Not that I'm critical of pitbulls, I actualy like them best of the bull breeds. But wouldn't own them unless I lived in the ACT.
Anther breed you may consider, which is a very large breed and obviously available in the blue colour you admire, is the Neopoltan Mastiff.
A Neo, or a quality Amstaff with ANKC papers may cost a little more. But if you divide that purchase price over the lifespan of the dog it seems far more reasonable. A dog is an investment you live in close contact with with every day, so careful consideration and the extra few dollars can be more than worth it in the long run.
As tempting as they may seem, I would recommend steering well clear of any blue Staffordshires, as the colour is linked with numerous health conditions. You may luck out and get a heathy one but is it worth the risk??