8008s -> N90s Upgrade?

[Eric Van Pelt]

I am new to this list and need some help!  I currently own the 
following equipment:

Nikon 8008s
Tokina 28-70 f2.8 ATX (Non D)
Nikon 75-300 4.5-5.6 (Non D)
No Flash Yet!

Should I spend $250 to upgrade to a N90s even though I don't have 
"D" lenses?  If I did switch to the N90s...I may consider trading in 
the 28-70 for the Nikon 24-120 "D"  but then there is the slow speed 
issue and another $250 to make the swich!  Thats $500 and I still 
need a flash!