Ok i have been doing some research and discovered that the Eibach anti-roll bar kit for the Alfa 145, 155 and Fiat Coupe has identical part numbers on both bars. So seeing that Whiteline do a front anti-roll bar for the Alfa 155, i can only assume it will bolt straight onto the Coupe?? The reason i looked into this is because the Whiteline bars are quite a bit cheaper than the Eibach ones.
Anyone been down this avenue?

I think you will get a little bit more understeer if you add a stiffer front ARB.

Yes thats a good point actually, am i better off just going for the Whiteline rear one then as i really dont want more understeer!

The rear ARB from Whiteline is 22 or 24 mm in diameter. I use 22 mm. I bought it via a fccuk groupbuy. The price was below £100
I think it works pretty good. My mechanic told me that it´s a pain in the ass to change it. Just so you know