I don't get it... you're wondering if it would be ok to get dyno tuned as opposed to what... road tuning? No tune at all? What does your mileage have to do with being dyno tuned (or anything, for that matter)?
ANYONE will benefit from being road and/or dyno tuned. However, it's not always necessary. In your case, I would start by getting rid of that BOV. After that it would be a good idea to get a stage 2 reflash or an internet tune (via email), but spending $400+ on a dyno tune is a waste of time and money (imo). Save that for when you have more mods.
Everyone hates on the HKS downpipe, but on a "stage 2" setup I have never seen conclusive evidence of there being ANY difference, let alone any WORTHWILE difference between the two. I myself could never feel the difference. I'm not saying there isn't any, but people need to stop acting like hks downpipes are detrimental to everyone's health.