ok dude... let me help you out.
first, read this info-- it will give a good idea of what fits per your 5th gen civic.
https://hondaswap.com/swap/viewer.php?id=50
Now, to your questions.
NA vs turbo:
You mention that are are still un sure which way you want to go. Before you do anything, i suggest you make up your mind on this. It's like being straight or gay- 2 totally differnt routes of building.
NA wants high revs, high compression, super good flow of air, long duration, high lift cams
Turbo wants normal revs, moderate compression::near stock or lower, and more air flow never hurts, stock duration, higer lift cams.
As you can see right there, there is a bunch of differences. there's a bunch more when we start dealing with parts (such as intake/header/exhaust... the NA ones wont work well or at all on turbo, and vice versa)
If you go turbo- you are going to have a higer maintence car. Oil changes at 2k instead of 3k, etc etc. There's also the risk of blowing up. This can be prevented by building and TUNING TUNING TUNING, but the risk is higher than stock no matter what. If its your daily driver and only car and you work 50 miles away, going crazy with boost IMO is not a good idea.
You mention cr/vtec and ls/vtec compression with boost....
IMO, if you are going boost, then stop thinking vtec. throw in the non vtec b20b or b18b swap, build it, and boost it. you will never miss vtec.
If you stay NA, def go vtec.
So basically, you are considering like 8 swaps right now....
b18c sir-G (JDM gsr)
SiR-G turbo
ls
ls/t
ls/vtec/t
crv
cr/t
cr/vtec/t
no matter what you choose, the easiest swap is to stay in the same generation of OBD. if you don't know what obd is, read this:
https://hondaswap.com/articles/viewer.php?id=9
so, any 92-95 motor will be a good choice. BUT, legally in most states, the engine must be the same year or newer than the car its going into.. so, you are set by owning a 92. any obd 1 swaps will wire in fine and be legal. (again, check local laws. i/e- in cali, its illegal to do head swaps.)
A big factor to consider is how much money do you have.
an sir-g swap will cost you about $3400.
an ls vtec or cr vtec properly built- $4000
ls $1500
b20b $1800
add turbo to any of those-- $3-4000
add hondata, 3" exhaust - $1500
as you can see, its NOT cheap.
so whats cheap? ls or b20 turbo is WAY cheaper than ls/vtec or cr/vtec turbo. see what im getting at?
Since you don't autox... turbo is a viable option.
Since you street/drag, turbo is the cheapest way to go fast.
What would i do if i were you?
ls/t
Hope this helps