if you're already familiar with them, then start with those exams. the only angle you might wish to be mindful of is to pick RHCA exams which could lead to a speciality title, e.g. RHCDS, while you're only half way to RHCA. Sadly your two there are alternatives in an RHCA so doing both won't help you get the RHCA in reality.
I've done 423 and 333, nothing else since those two a while back. My RHCE has lapsed now too... easy to pick it back up though.
Last edited by acid_kewpie; 05-04-2012 at 05:02 AM.