I've owned and drifted 6 now, all were daily drivers and HARD used drift cars.
IMO there's no real drift advantage of the 1.8 if you can actually drift properly, IMO if you need that extra tiny bit of grunt the 1.8 has, you're doing it wrong. (2 of mine were 1.8)
Stock VLSD most come with is wank. Torsen is pretty good, but I'd choose the welder every time. All but 1 of mine I welded up in the end, 1 had a Torsen.
People cry about cheap coilovers, but they're fine. Fuck, I left 2 of mine on stock suspension as it's fairly high and soft, but works good.
Stock steering wheel on most Mk1s is a fairly small Momo one, better than 99% of steering wheels, though on one I fitted a tiny little 300mm OMP one, which I actually prefered as it made the steering even sharper.
They've not got any lock really, and while washers are cheap n easy, when decent hubs are only £110, I've gone down that route on 2 of mine, 2 others had lock washers, the other 2 I left stock lock- Didn't stop me.
Fit a bucket seat, that's the 2nd most important thing behind a diff that works properly IMO.
Aside from that, fuck it, just drive it. Getting the skills will make you 100 times better driver than any modifications will.
Once you get used to how to use one properly, the most common occurrence for you will be people in 400bhp+ 'drift cars' holding you up by drifting too slow for your 100bhp car.
This car was 400quid and 100% stock 1.6 barring I welded the diff and chucked in a cheapo drivers bucket seat. Was voted driver of the day in it.
This one I had was a 1.6 with a welder, cheapo coilovers, bucket, and I think lock washers too. No problem 3rd in the dry on a big track (Pembrey GP)