The DL's have a neat prescription insert option If you don't already know but that will certainly put them out of your budget. Something for future consideration perhaps.
The RRV (Rhodesian recon vest) is a good option IMO. Lightweight, flexible and expandable with back panels and packs this is a popular choice among many airsofters. Beware of some of the china made vests quality is lacking. Condor makes a good product for not a lot of money, not military quality but it meets the quality requirements of most airsofters.