Hey there mate,
Used to work in Anns Cottage surf shop kittin out people with suits-
We used to get really positve coomets from O'neil suits(they fit really well) Pshyco 2 is a fantastic suit, seam welded,firewall, back-up system (this is a must) really flexible but it is about £250
I couldnt afford the o'neil and amazingly the gul Ntro suit fitted me better which i was gutted about

BUT never the less it is still a decent suit, very pleased with it. Its got an over the head back up system which is quite tight around the neck, i believe they might have changed it this year, to something more like the o'neil one (mine had to be sent back- they stitched it wrong and it almost strangle me)
SNUGG do some amazing suits i do beileve- dont know too much about them, as we didnt sell the in the shop. They also do Cutom made suits
My summer suit is an XCELL suit which is fantastic- will defo be buying another suit- maybe even a winter one when my GUL one dies lol.
loads of other makes to consider, Billabong do some lovely suits but- lol sounds funny, i thought they were REALLY heavy.Rip curl also have some nice suits.Also suits with Hoods built in- depends on how cold you get and where your surfing.
If you can avoid Basic winter suits, at cheap prices- as flexibility is shockin (i had one for ages

) Maybe look out for last season winter suits at bargain prices(usually minimal diferances)
Another thing to consider is a o'neil thermal rash vest, or any thermal rash vest (o'neil is from experience, i have one- i sold loads- and ppl would come back in the shop chuffed with the vest and said it made alot of differance) i love mine and even used it in the summer underneath my shortie for a bit of protection.
Defo get boots, and some decent gloves- again o'neil seemed to be a decent fit.
Hope this helps