Worcester, ideal, Bali, vaillant - which one?

[mondeoman]

Have an urgent need to replace a 10yo Baxi Solo HE24, as it's leaking a bit (!), and it looks as though these are the manufacturers of the favourite / most common replacements.

I'd like to upgrade to a 30kw (20s detached 5 bed) as I think that 24kw is just a little bit on the small side, but which one would you put your money into?

Budget is c£1k max for boiler + 1.4m flue, fitting extra on top.

Baxi EcoBlue
Worcester Greenstar cdi
Ideal Logic +
Vaillant EcoTec Plus

Ideal is cheapest, but will it "just work" and be reliable?

[mondeoman]

Ask three men a question, get 4 different answers. I do like the idea of stainless heat exchanger, but if the system is treated with fernox at time of install, an alloy exchanger should last ok.
More concerned about the robustness of the controls and peripherals - current Baxi, despite leaking like a sieve now (some time with no fernox), has been great , with only a flame sensor change last year. If it wasn't leaking, I wouldn't change it.