Hi Pete,
I'd be inclined to buy some older second-hand planes and 'do them up' if necessary. Actually, the Ray Isles offer sounds very good. I think he has the right idea though - fitting a thicker blade to an older plane will improve the performance. I've just done this by treating my Stanley no.4 to a Clifton blade; edge retention is excellent, although I had to spend some time opening the mouth up with a file and there is an issue with the Yoke/Y-lever not being long enough... (That one will be resolved shortly! :wink
Even upgrading only the cap iron will make some difference when working with hardwoods; mainly less chatter.
I admit to owning a couple of 'specialist' planes (Veritas/Lee Valley Bevel-Up Smoother and Scraping Plane...
) but, as far as the standard 'bench planes' go (no.4, no.5, no.6), I don't believe it's necessary to shell out over £100 for each in the beginning. My only except may be the Clifton no.7 - even the old ones tend to fetch well over £100 at auction... If I was looking for a plane that length, I'd probably save a bit more and go for a Clifton.
As far as fettling goes; sharpen the blade [oh, yes - you haven't considered how much you'll need to spend on sharpening gear yet!!! :twisted:] and try to cut a piece of hardwood - if it works well, leave it alone. If not then, you may need to start looking at flattening the sole (which isn't too tasking on shorter planes).
Next time we meet, I'd be happy to go through that mixed box of 'plane parts' and help you to see what's what.
[I'm buying timber for the chest of drawers next week ~ finally!!
:wink:]