Personally I'd so 'no' to any of them for a 3yo, but as always, it depends on the 3yr old. How do they measure up to what he/she likes to play on in a playground? To me, they all look good for an 18mo. A 3 year old might have a bit of a fun, but not for long.
Would you be better off going for something bigger, but second hand?
It's a tricky one, cos we got an unexpected inheritance and got DD (nearly 3) a huge (and embarrassingly pricey) TP climbing frame recommended for 4yo - 12yo, on the basis it would at least last and it was definintely the right decision. It's been up for 6 months and she can do the whole thing herself, uses it as a den etc etc. But then, climbing is her thing. Many of her (larger) mates struggle on it, so as usual, its horses for courses.
There are a few much cheaper TP-look-alike sets out there mamadiva, and again I'd suggest you try ebay/freecycle for local pick-up climbing frames (far fewer bidders cos often the sellers/givers away want you to dismantle it yourself and of course it's collection only). But that does mean waiting until the right thing comes up. Oh, or netmums local notice board perhaps?
Also, we live in a rented property, and our landlord (admittedly not a HA) didn't mind us digging a pretty large hole cos our garden is quite slopey, and we needed a flatish surface (we plan to be in this house for several years!). If you or your DP are a bit handy, it's possible to drill some kind of fixing device into a metal frame and peg it into the ground, like you do with the wooden ones.