I should neg rep you for this statement. Srsly.
1. Hondas don't have torque. They're the torqueless wonders. They rely solely on horsepower and top end. Hence the reason they have things like VTEC and 9k rpm redlines.
2. The OP is OBVIOUSLY a noob (no offense to OP). Are you really suggesting that someone inexperienced with cars do a turbo kit/supercharger setup?
3. Have you ever seen what a turbo kit can do to a stock automatic transmission? At the very least he would need to install a trans cooler, and to even appreciate boost, which even with a small T25 won't kick in until about 3500rpm or so, he would be looking at running hondata/uberdata/crome on his ECU to change the shift points in the auto trans so that it shifts higher, allowing him to enjoy boost.
4. Even with the shift points higher, he would still probably be looking at rebuilding the trans for more aggressive acceleration, and it wouldn't be a bad idea because I doubt a 15ish year old trans would hold up very well to the added strain of shifting higher as a result of said chipped ECU.
5. As has been said, more than about 6-8 lbs of boost and he will have to build his engine for turbo. Since when is it easier to build an engine for turbo than to do a swap?
6. At 6-8 lbs of boost, which is what a stock SOHC will hold (and I am assuming he would want to stay with a stock block), you're looking at maybe a 25-30hp upgrade. A stock D15 on the dyno puts out about 112ish hp, and that's when they were new. So we will say he's probably putting out 105ish now, compensating for wear and tear on the engine, yadda yadda.
7. So he will be putting out roughly 135hp with a conservative turbo setup.
8. This conservative turbo setup, which will give him 135ish hp, will probably cost at least $1500, and that's if he leaves the trans alone.
9. I can pick up a D16z6, which puts out 137 stock (new from honda, so say 130 now), for about $300 on a decent day. I can then spend about another 250 or so and put a D16y8 head on it and either put a y8 exhaust mani or an aftermarket header on, and since the y8 components flow better, have probably 140ish hp.
10. 140ish hp > 135ish.
11. N/A motors are generally more reliable than turbo motors. Turbo you wanna get boost, so you're pushing it, it's having to deal with the extra stress of boost, yadda yadda. So OP can spend 1500 to have a turbo d15 with 135ish hp, or 600 to have an N/A z6 frankenstein with 140ish, or 300 for an N/A stock z6 with 130ish. Hmmmm....
12. If OP insists on spending 1500 on anything, it should be put with a couple more bills and put into a B16a3, which will give him 160hp (stock, new from honda), and you get all the joys of a DOHC VTEC engine.
13. And a 5 speed swap.
/rant