How much to spend on what component

Guys,

I'm currently using a Rega P2/RB250 with Mitchell balance weights/Ortofon 520 mk2. I've had this for about 18 years now and feel the time is right to upgrade. I don't want to fiddle about upgrading one part at a time or buy from some on line retailer. I listen to a lot of different music, CSN&Y, Crusaders, Led Zep, Jesse Colin Young etc so I want my set up to be very transparent and detailed but I'm not too bothered about a lot of base.

I Live in Spain but will be buying from a retailer in Berlin, Germany. After talking at length with him I have some ideas of what I might like but I have hit the age old problem. The more research I do the more confused I become.

My initial idea is a Nottingham Analogue Studios Interspace Junior with a Nottingham arm and Micro Benz Gold cartridge.

However he has some nice tone arms and I'm particularly taken by the look of the Morch UP-4.
Having said that my budget is $2,800, (or 2,500€, £1850)I'm completely open to advice so, a couple of questions..........

Generally speaking, is there some sort of rule that says you should spend a given proportion of the budget on each component ie: 50% Turntable 30% arm 20% cartridge? (I've just made these up to illustrate my point)

What do people think of the Nottingham choice?

I really like the Morch so is it a decent arm and is it worth fitting into a set up?

Being in Europe, my dealer Turntable choices are limited to Rega, Clearaudio, Nottingham, Project and Roksan.

Thanks, any advice would be appreciated