Hi Selly,
It all depends what you want to do with the planes. If you want to plane mainly soft wood or sweetly grained hardwoods, then you can make most planes work reasonably well (although you might have to do a bit of sole flattening and things like that). But if you want to plane really hard wood or stuff with difficult grain, then you want something better.
At the moment I'm planing what seems like miles of oak. I have both Record and Clifton planes. The Records, set up normally, make really hard work of it. The Cliftons, on the other hand, are in a different league. It's a combination of things - the greater weight; the better precision; the better, thicker blades; the Bedrock frogs. They will take beautiful shavings from stuff that the Records won't touch.
I've turned some of my Records into scrub-type planes (wide mouth and very steeply cambered blades) which I use to hog off large quantities of wood. Here's me hogging off thick shavings of oak with my Record #7 "scrub"
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But for finishing I will use my Cliftons
With regard to what to buy, if you want just three I would go for a Clifton #7, a Clifton #4 1/2 and a Veritas low angle block plane. Then buy some cheap Records second-hand and turn them into scrub planes
I should add that my views are those of someone who has no machinery. If you have, or will be getting, a planer, saw bench and the like, you might want to choose something else.
Hope this is of some help.
Cheers :wink:
Paul