How well armoured was the Roman army?

[Sardaukar]

Legions were very expensive commodity and I am not sure if it was actually financially possible to equip all troops with full armour.

http://www.strategypage.com/articles/de ... .htm#_ftn4 (itself very interesting article about Cnaeus Pompeius Magnus strategic options in start of civil war)

Footnote there:

Cicero's comment that the two under strength legions he controlled in Cilicia in 51 B.C. each cost about 3 million sestertii in pay and maintenance a year (Cicero, ad Fam., V , 20, 9, & ad Att., V, 11, 5), which was about 60% of the annual revenues of the province (Cf., Frank, pp. 136ff).

Also the comment by Crassus (IIRC) that man should not consider himself rich unless he was able to raise and equip and legion, vastly more expensive than just pay and maintenance.