Now I have the same cpu as you and this is what I did.
E4300 1.8ghz 800mhz FSB -> E4300 2.4ghz 1066mhz FSB
using this modification :http://www.overclock.net/intel-cpus/341123-intel-bsel-vid-mod-guide.html#post3980695
Now you need to know if your mobo supports 1066mhz
you need a circuit writing pen (got mine at Radioshack)
you need a steady hand
you need to be kind of desperate and willing to risk your cpu
but I have read many people doing this mod successfully
and mine has been running about 3 months 24/7 with no problems
I did it because I have a Dell and it is the only way to overclock.
Proceed at your own risk
You have been warned