single cam boost or ls swap ?

[Formally...]

and slinging rods

Ls boosted would make more power then a sohc boosted anyday!

But to the OP I would do a LS swap and turbo later

Slinging rods

Okay the LS TURBO (not NA LS like OP said) could make about 30-50whp more stock then a dseries but you have to factor in the price of a tranny, axles, shift linkage. etc

The dseries is plenty strong. Scotty (scttydb411) has tried many times to blow his BONE STOCK 140k mile Y7 up on the dyno and it is still going strong (255whp). I have turned up the boost on my daily to 15psi when it was only tuned for 9psi (motor was already making funny noise and i didn't care). Still made 220whp the day I pulled it out.

[SoLJames95]

Slinging rods

Okay the LS TURBO (not NA LS like OP said) could make about 30-50whp more stock then a dseries but you have to factor in the price of a tranny, axles, shift linkage. etc

The dseries is plenty strong. Scotty (scttydb411) has tried many times to blow his BONE STOCK 140k mile Y7 up on the dyno and it is still going strong (255whp). I have turned up the boost on my daily to 15psi when it was only tuned for 9psi (motor was already making funny noise and i didn't care). Still made 220whp the day I pulled it out.

X2
I was in the dilema, and Its only how you drive it and tuned is the key! My first boosted d had 202k and it was a d15b7 and made 190/181 at 9 psi Stock internals. Ran for a year( thats with me racing street light to street light and racing it on the track and Charles launching like a mofo!) It lasted a year, and the only reason it blew was because I was doing 155mph going to Columbus and lost oil and cracked a sleeve.
So say D..... Also in the long run cheaper to fix. I rather have a boosted d then my ls/v. Maintence prices on a ls are cheaper then d series. Also D has gets better gas.