Yes, I would have suggested the Workshop Heaven piercing saws myself, the tensioning screw on the front is a really useful touch, my only minor complaint is the handle is a bit narrower than I would like. I just wince when I see the price, I know it's still not a fortune but I picked up one of the 100mm saws for about £10 only last Easter... I would go for the 100mm over the 75mm, it gives you a useful additional additional clearance without going up to true fretsaws, i.e. frame depth in the 10-20" territory which are very unwieldy in use.
How fine are your dovetails? It may be the coping saw is still the best option. Be aware that although a single grade is generally only available at retail they do come in different grades. I've found myself doing the reverse transition in the last year, i.e. fretsaw to coping saw. I picked up a scrollsaw that will take either blade and tried it with coping saw blades, nice to have a blade that's almost indestructable compared to a fret or scroll saw blade. Finish wasn't quite what I wanted until I went to Eclipse 24tpi blades and that combination of saw and blade is now essentially my default option for quick or even quite detailed or moderately heavy cutting.
