here is my 2cents:
you have an a33 cefiro and obviously want more power. ofcourse $$$ is needed so what is your budget? how much cash willing to dish out? i assume that you wanna keep your car for quite a long while and have reliable operation even after a swap plus the added benefit of having warranties for the parts correct?
then, maybe rodney could clarify but drop a VQ35DE in and replace the tranny with a Nissan 350Z/Nissan Maxima (USDM)/Nissan Altima SER/Infiniti G35 6-speed manual or get the more powerful 5-speed automatic/manumatic tranny lifted from an Infiniti I35/Infiniti M35/Infiniti G35/Nissan 350Z etc etc
get your parts from JWT like:
S1 Billet cams, valve spring & shim kit, friction plate kit, clutch set, sports flywheel, pop charger, gt40r turbo, ceramic headers
thats 39HP added to stock 300HP if you get your VQ35DE from the 350Z and 6-speed manual tranny. So you have 339HP not including the boost you will get from that turbo. Im sure you will clock 500HP+
you can also add the stillen valve body upgrade for the automatic tranny if you choose.
other stillen parts that u can get are:
hks super fire plugs, stillen performance alluminium radiator (if you choose the 6-speed tranny)
another upgrade is the borla cat-back stainless steel t-304 exhaust with a turbo muffler 2.5" diameter.
and lastly a Brembo sport disc OEM replacement rotors (ventillated and cross drilled) with Ceramicool pads to work on the stock calipers should do fine.
You can have the baddest Cefiro in T'dad with a very bad price!