when I did my car the most important thing to me was suspension.
it just so happened I did it at the same time as a remap.
front & rear anti roll bars & a decent set of springs will cost you about £500 fitted, you could add the extra & do the shocks at the same time, but this would add another £400ish.
With the remainder I would go with the dogbone mount & leave you standard shocks on for now.
budget blown for now, but you could just get the bush kit for the dogbone (a tad harsher than say an EIP) & maybe replace your front discs & pads (standard ATE discs & DS9000 pads) & just push the budget a little if you get them all fitted at the same time.
so your car will handle, get the power down & stop really well for under £700.
If you could find a mate to fit the above you would be within budget.
you will be so much faster everywhere because of the confidence factor you may resist that remap for a whole week
hope thats helpful