Only bad thing about trying to compete with the new Zeds is if someone puts on a set of drag radials, throws a K&N setup on and a small nitrous shot. Then at that point, it is very VERY hard to compete against one with a low 11 second Buick, because combos like that on the new Zeds are running into the high 9's to very low 10s on a baby 125hp shooter. Bone stockers tho, you'd be ok as long as you are in front by 100 mph.
Pretty much everyone's 61mm compressor wheel equipped turbos are more than capable of running 11.00s with the right tune and good 60fts. I've heard a lot of very good things about Jacks CPT61BB, as well as witnessed first hand results on my buddy Dons car with a Precision PT6152S journal bearing. It really comes down to personal preferences and who you like.
In todays Turbo Buick market, I would go with a vendor who will stand behind their products with honest and proven answers and who will give the best customer service both before and after the sale.
Just my O2s worth.
Patrick