I'm looking to build a pair of mid sized full range PA speakers. Main use will for home practice/rehersal - putting vocals. guitar, synth, drum machine etc through.
I don't have a separate electric guitar amp at present (not ideal), and also want to mic up/wire in acoustic. So these need to have everything chucked through them - with the inevitable compromises that implies.
Later I might look at adding in separate bass bin and/or using in small rooms for concerts (up to 50 people). However for now mostly for just messing about at home with a couple of people.
Personally, on that budget, I wouldn't look into building cabinets, as the market is flooded with half decent 12"/1" cabinets at that price.
On 150 - 200 W that Celestion design looks good but on higher power levels it might not be the best choice. However I doubt that most products on the market will have better components at that price, which makes it actually a decent choice.