If your boys will not have cars, then the closer they are the better (Del Cerro is north of the freeway 8 and closest to SDSU). But, if they will be driving, then you have many desirable areas to choose from.
Since you mentioned wanting to be able to re-sell this condo in 3-5 years, I would recommend Pacific Beach, and even Downtown, since these areas continue to be popular with people of all ages, but are especially popular with the younger generation.
I won't quote price points here becuause prices are dropping every day. And as soon as I print a number here...those stats could be different. There is even the chance that things will be very different by the time you are ready to buy.