Suspension comfort is down to the individual - Plenty of options out there for you. We would always recommend a coilover kit, which has been designed to work as one, and you can preset the height.
For vans up to T30 we recommend ST X coilovers - Which is made by KW, this can lower from 30-60mm
For T32 we recommend Bilstein B14 Komforts - Which lower from 40 -70 (Although sit lower)
If you want to retain your VW factory warranty then its the Eibach Pro Street - Similar lowering to the ST X but more expensive - However whatever kit you get will come with its own warranty anyway.
There are plenty of decent suspension kits out there to choose from - Get some feedback and try and have a drive to decide what suits you best. Wheels - 18's will alway give a better ride than 19's, which will give a better ride than 20's on the same suspension, due to the larger sidewall - If that makes sense.
There are a lot of kits out there that go up in price from the ones above, all with their own advantages, that some people might not even feel, however for example KW manufacture a specific Street Comfort Kit, adjust from 25-40mm - We have a set going on a vehicle this week, our first one we are fitting, so will report back accordingly.
Good luck with your search - If you want to demo any of the kits mentioned above we run a demo van for each.
HTH
If its a T32 its a waste of time and money changing the ARB as they already have the thicker ARB
Although its thicker the H&R is still an upgrade and does improve the handling and body roll, over the standard ARB.
but that arch gap 
