Well I wasn't disputing the walue of the infantry. If well trained and motivated the most important part of any army. I was expressing my opinion that the Roman cavalry was indeed an effective force. That it is a misconception that the legions were week in cavalry.
"I agree with ya, the equites were prestigious, but there is a difference between prestige and effectiveness."
Now sorry but this is bullocks. A prestigious unit in any army is prestigious because it's combat value is very high, or because it is perfoming a vital duty.
"Ditto. Also, there are only so many nobles."
Well you make that remark based on what? Being a noble was wastly different in Roman society than it was in medieval societies. During the reign of the Emperor Augustus, the rank of equite was officially defined. One could become an Equestrian when one had some 400,000 sesterces. However if one lost his fortune he immediatly lost his status too. Only during the secound century AD. did the Equestrian class changed into more like a class of bureocracy.
And one more misconception. The Auxilliary units where also effective, and loyal units. It was one of the most original and effective method of Romanization (it is debated wether it was intentional or not)...