There are quite a few more options than has been mentioned so far. Before I get to them I'd also endorse 'Knot-2-Kinky'. I use it for a number of different applications, especially fly fishing for pike. It's far and away the best wire I've used for this. It's easy enough to knot in lighter breaking strains (I've used 6 lb. for perch) but becomes increasingly awkward to work with as you go stronger. I would agree about crimps being a good option when you get past about 20 lb. b/s.
Regarding other wires, I used 15 lb. Drennan Soft Strand for pike fly fishing for many years without any issues. Its main advantage is just how supple it is and also the ability to use a twist-melt connection - thereby reducing the need for clips etc. The downside to this wire is the green coloured coating. Unless you're presenting a bait on the bottom I've always thought it looked unnecessarily conspicuous.
I would suggest having a look also at the American Fishing Wire (AFW) range. They do a couple of wires (49 strand and 19 strand - coated and uncoated) which I think would be ideal for perch. I noticed on ebay the other day that Dave Mutton is doing a great deal on AFW Surflon Micro Supreme (19 strand) in 6 lb. b/s.
https://www.ebay.co.uk/itm/AFW-Surf...re-Trace-leader/324288798085?var=513361640880
Depending on what you're doing with it, there is another inexpensive option that not many people seem to know about: Tiger Tails Jewellery wire. You can get 100m spools of this for a couple of quid off Ebay. It's a coated wire that comes in lots of different colours (some more suitable for our purposes than others) and in 0.38 and 0.45mm diameters. I used it for fly fishing for pike for a couple of years and, providing you either knot it or secure connections with a twist-melt, it was fine. A word of warning though; don't crimp it. My mate tried this (also fly fishing for pike) and found it had a tendency to fail at the crimp whilst casting. He partially solved the problem by adding a sleeve to prevent flexing but I would suggest knotting or a twist-melt are both easy and reliable and I really wouldn't bother with the crimps.
Last thing, on knots; I've used a bowline knot with various different wires for well over 25 years and I find it absolutely reliable. Hope that helps ?