VTEC isn't pointless with turbo, it still offers more duration, more lift, it's a larger cam lobe. What becomes pointless is the valve overlap in VTEC, but if you were to disable, you'd lose the lift/duration, so might as well keep it!
as far as ls/vtec vs. turbo...two different worlds. LS/VTEC is nice, but roughly the same cost as a B20 VTEC, which is faster and more reliable, but requires a little more work to the bottom end to retain compression.
turbo is nice, but plan on learning a lot about your car or paying frequently to have it fixed. turbo is never as easy as it sounds, but it's fun if you get it done. I know the fastest street driven civic in Phoenix is an LS/VTEC turbo car. FULL INTERIOR he went 10.20...just showed up, threw slicks and skinnies on it and kicked everyone's ass, then drove home on 19 inch rims.
it's all up to you man...if you got the money, or the time to learn, TURBO. ALways the funnest way to go. Good luck either way bro.
-B