I used to race on a Spark with a load of very light parts, excellent race bike – the DT Swiss shock is poo though, an RP23 is a far better choice.
My only problem with the Spark, apart from the fragility, was the very low BB height, I would constantly batter the pedals on anything a little rocky.
I went from an Anthem to a Spark, the Spark tracks better, as it’s lower, but isn’t as quick responding as it felt like it had longer stays. It’s better, far better, with a 120mm fork, which raises the BB height a little too.
Agree totally with Njee, don’t spend £900 on a set of wheels, that’s stupid. Really stupid. I’d spend £300 at most now, but if you’re racing, £400 – are you a pro? they’ll get the wheels at cost, less or free – so only numpties will be paying the £900 price tag.
Use the left over money for a trip to the Alps, or Scotland, or if you’re interested in Racing – gels, or races, or a trip to see Jedi to actually get faster 😉