For various reasons, we've had a budget shaker-style kitchen from Howdens for 6 years now and it's been brilliant.
We have a Howdens 1.5 sink. We bought a mixture of appliances online which don't exactly match but are fine. We have integrated as much as possible (fridge/freezer, washing machine, dishwasher, microwave, bins). We have Howdens square edge laminate worktops and pretty standard slate-effect laminate flooring. Got some quite high-end tiles. Nice lighting (spotlights, under-cabinet lights and a couple of lamps) which makes things flexible. Nice matching blinds on the windows.
The thing is it's REALLY well-designed and fitted. DH is a joiner and did it himself. Everything perfectly square and level, no awkward gaps or fillers. Nice handles. Everything nicely set out with a few plants/accessories.
We had NO money when we did it and it came in around £6k all up. It's still lovely.
Main reason we did this was so that if we extend in future we can reuse a lot of the cabinets and appliances.
So...
Don't discount budget products, the fitting is just as important
Find a good, reasonable joiner to fit it (your dad?)
Splash out on tiles if you want to. Plan the colours / finishes of your worktops, cabinets, flooring, walls and tiles before you actually do anything.
Integrate as much as you can for clean lines
Find clever solutions for awkward gaps and boxing in your boiler/pipes if they're in the kitchen
Don't choose anything too trendy or too shiny