New gravel bike wheels – Commute – Advice needed

Hello, I’d appreciate some advice in terms of getting new wheels. I’ve got a Specialized Diverge A1 sport with the original wheels and hubs (AXIS Classic Disc, wide). I ride about 250km a week on a commute from South to West London. The route is all road in winter but when it’s dry about 30% is on a gravel path. I weigh about 75kg probably and travel with a pannier and rack which probably has 5kg> of stuff usually.

I have done a few thousand kms since April ’15 and the hubs are on their last legs but rims don’t have any obvious damage. I have a budget of £400 but preferably less, however I want some wheels that can take the commute for at least the next year and appreciate I may need to splash out. I am lost in the sea of options between factory builds, ordering hand-builts, buying parts separately and getting my LBS to put them together or to try and do it myself.

I’d be grateful for anyone’s opinion/pointers/suggestions on which options to take. Thanks.
Dabulamanz