I think the uprated dogbone bushes at this price point can't be beaten as they significantly improve traction in the corners as the inside front wheel doesn't hop anything like as much providing not only grip and less understeer, but less ABS light. An absolute must.
How about coilovers, I hear you can get a great set from Ebay for £49.99 plus shipping. A little bit over the £50 but well worth it,
PMSL