Strength / Weight Training

Can we get the discussion back to those fancy-schmancy adjustable dummbells? I've gotten hundreds of hours use out of my York spinlock dumbbells, but I'm stuck with maximum 25 kgs. In theory I could go up to 30 kgs per dumbbell, but that seems risky to me. I would like to get up to somewhere over 40 kgs ideally. I'm pretty skint by any measure, but given the amount of use I could get out of a pair of adjustable ones I could justify the cost.

My research on the interwebs so far tells me that a lot of people dislike Bowflex. Powerblocks are recommended by lots of people but ugly. My understanding is that they are the priciest option in the US, but on Amazon in the UK there is a deal on the 'sports' series that makes them about the same price as Bowflex. The Ironmaster ones are pricier in the UK than the other two, whereas it seems that in the US it's the other way around. Are any of you guys using them? The cheaper brands, are there any hidden gems among them?

http://www.fitness-superstore.co.uk/dumbbells_and_kettlebells/bowflex_441kg_selecttech_dumbbells_pair/15332_p.html?gclid=CPv47pGQhL8CFer7cgod5H0AOA
http://www.valleyfitness.co.uk/quick-lock-dumbbell-set-75-lbs-34-kg.html
Powerblock Sport 9.0 Dumbbells (stage 1): Amazon.co.uk: Sports & Outdoors

Surely something like this would make more sense? I feel like you could load this up with more weight in time, but for a fraction of the price? You could also get regular sprung clamps which would take up less real estate on the bar and so you could load it heavier. The tensile strength of the bars will probably be considerably more than the 40kg plates that come with it so if you really wanted to i'm sure you could find slightly larger plates for it and push them to 50-60kg.

http://www.ebay.co.uk/itm/80KG-OLYMPIC-DUMBELL-SET-2-WEIGHTS-MAKES-DUMBELLS-UP-TO-40KG-x-2-/171359985638?pt=UK_Strength_Training&hash=item27e5d9dfe6