ToYoTa CrAzY

hey folks, i've had this supra turbo targa sitting for about 3 years now with no definitive plans. it would probly be wise to throw in a new engine if i were going to rebuild but i don't know which direction to go in at that- thats my main question: should i throw in a stock 7mgte (standard as in std oem north america) or jspecd 1jzgte or 2jzgte (std mk iv) the basics of my mk iii supra: (incl. problems) engine - runs, but burns a qt every 300 mi turbo 5 speed - no problems on trans side targa - leak on driver side painted in 99 or 00 - still good but rear bumper needs a touch up shaved door handles 18" chrome albas meineke exhaust i think thats it. if i want to rebuild it has to start with an engine- no brainer, but what? i'm fine with STOCK turbo engines, but obviously the better the mod options on each engine - the more appealing that option is. i say better as there are of course economic aspects. i don't race but of course we all want a faster car - i don't need to spend 15gs to make a 12 sec car. but say if i invested an extra 5gs over stock and can cut a sec off i might take a look into it. by the way i'm just spitting numbers, i've never priced engines before, nor have i ever dyno-ed a car. i'm pretty sure though a stock 7mgte turbo probly does around a 7 sec 0-60 around a 15 sec 1/4 mi. so with that - what should i do? single turbo / twin turbo? can i maybe upgrade turbo on top of a rebuilt? OR if you know someone who maybe done the whole shebang twin turbo, injectors, afm, exhaust... and it seemed like it was worth the cost. any opinions? OOOOORRRR, should i just buy another one already built or finally i see 04 gtos in a reasonable price range $14,000 + thanks