Why bother with a £1K + cost of a modded beam, fit struts instead at the rear, will piss all over the modded beams, but depends what you want.
Also remember, that an opinion is just that, someone else's opinion you might disagree, so try to get a ride in cars with different set ups.
I've used both koni and ahmed springs, but find the avo coilys vastly better.
Any decent shocks and springs will kill 90% of thr tramp under hard acceleration, a decent diff mount will cure the other 10%, then add a 22mm rear arb, or listen to the ones that have never used it that say it doesn't work, your car you make your mind up.
tabetha