This is a very broad question and the answer depends on how much you want to spend. If money is not an issue of course get the brand new 4.8is. Like the others said if you can't afford a 4.8 then get a used 4.6 either '02 or '03. What about a lightly used, face-lifted '04 4.4i?

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Dinan S1 pkg / 22" Iforged Swift - Toyo 295F*315R / Eisenmann Race - OEM tips / H & R 15mm front
30mm rear spacers / Euro-spec headlights / CF M Competition steering wheel / Full CF interior /
6000K D2S / HID fogs / AiBrights V3 / Interior Xenon / LED sidemarkers / Matte black grille & hood vents