loo, you asked opinion, and I'm just giving it.
The K series is good, but it's not currently cheaper than the B series if trying to get max power.
Try compare this setup to a the K series and you can see why.
BC cams/retainers for turbo 4k
Dart block 11k
T3/T4 size hybrid turbo (any brand) 3K
tubular manifold - 3.5K
B16A head -1K
EG wiring - rm500
exhaust muffler piping set - 2K
Pistons and rod 4k.
management - 4K AEM/EMS
Transmission - 2K
35K, all new parts except transmission, add 3K more, and that transmission is a custom geared transmission.
(maybe you also need to tack on a few thousand for the crank bearings, rubber seals, etc, but that's usually never mentioned in conversion/engine transplant costs)
Now at first it seems expensive compared to the K series, till you notice that it's using forged parts and a sleeved block, and still manages to cost just a little more than the K series you mentioned, and will make as much horsepower as you dare to boost. Definitely more than a K series will put out even after you pour 33K into it.
I've nothing against the K, or you, dcloo, but for me, I'd wait for the K series (the R version, not the CRV/GSR one) to get cheaper. Afterall, the unmoddable stuff from the K series is the 6 speed transmission after all, and that's one of the best things about the K, the extra gear. I don't think the 5 speed K series gearbox is that well known for it's ratios.
If you think it's affordable now, go for it! I'm just giving my opinion, like you said in the first post.
For D series owners, I think the K series would be a good swap (and possibly cheaper swap), but for current B series owners, I think sticking with the B series is cheaper.
I'm also learning as I go, loo, but I really did ask around about K conversions, and the price I got two years back was shocking. It's definitely cheaper now, like you say, but I don't think cheaper than the B series just yet.