All of them! Except the DC11 and DC18.
In particular I liked the DC07 and DC14 (WITH the seals in the soleplate) As they are quite powerful with excellent suction and the DC14 is probably the most reliable Dyson ever made! Also,, I like the DC25, DC24, DC33(sort of) DC41, DC41 mk2, DC55, DC75 Cinetic big ball and the Total clean V6.
My favourite Cylinder is the DC08. It's powerful suction (330 AW constant) and excellent floor tool makes it a good performer for a straight suction machine. The DC19 is similar but has diff tools, click fit and less suction.
I like the DC21 Motorhead which is the same thing but with a PN.