a decent set of brand new wishbones will feel so much more tight than old worn out ones when it comes to handling anyway.
I've honestly never bothered with trying to uprate the bushes in a set of suspension arms so can't really comment on them as to whether it was worth it or not. I've never really seen any value in doing it mind so I've not bothered!
I don't think you need to bother with getting genuine alfa ones either, I have pattern parts on my GTA for the 18 months that I owned it and never had an issue with them.
got them as a full set, 2 upper and 2 lower off ebay for a decent price and fitted myself no bother happy times!
1999 156 1.8TS Sport Pack 3
2001 166 3.0 V6 24V Super
2003 156 GTA 3.2 V6 24V
2005 156 1.9 JTDM-Jet Sport
2008 159 1.9 JTDM Lusso
1997 GTV 2.0TS Lusso
2001 147 1.6TS Lusso