snomint3 a early welcome to Jax
I took a look at the 2 locations at the beaches you are considering.
Tide's Edge in south PV is farther south from JTB almost to St Aug.
Selva Tierra is a little north of Atlantic Blvd.
Both of these would probably be a 20 min maybe more drive to get to JTB.
JTB to the 95/Baymeadows area is aprox 17 miles. Depending on the time he left this could take 25 to 40 mins.
When we lived in PV just south of JTB as long as we were on JTB by 7 we avoided most of the traffic.
Another area you might want to consider is 9A/Baymeadows
The elementary & middle schools have both been "A" schools for the past 7 years. There is also a new high school they have broken ground on that is suppose to open 2010 .
This area has a wide choice of really nice neighborhoods both gated and non-gated.
This area is about 5 miles from the St Johns Towne center (super target

)
and 10 mins to the Avenues mall.
I did a quick search on rentals in your price range and found houses in Deercreek Deerwood and James Island all gated as well as a few in East Hampton non gated
This might be another area for you to consider.
Karla