Do you like your current Integra? Would you be happy driving it after everything is up to par?

If yes, then keep it. If you plan on modding, your car is just as good as a newer Teg. It's cheaper, and you start out with more cash to spend. In my opinion, Personal Value > Blue Book Value.

If not, sell it and buying something newer. You can easily find something within your price range. As with any used car, take into consideration the possibility of surprise repairs.

As for selling value of your car - I would need to know more about its condition. Body, Interior, Odo. Miles, etc.