aluminum radiator is definitely a wise investment.
i would highly suggest, rather than spending money on electric fans (which many times, can be LESS effective than the stock fan) just get the gktech fan
$99 at enjuku
http://www.enjukuracing.com/products...sx-silvia.html
$119 at frsport (but i'm pretty sure they'll price match)
http://www.frsport.com/GKTech-GK-RE-...T_p_59175.html