the 2nd vid is a dreadnought guitar. be forewarned however, if you've never played that kind of guitar, you better test it first. dreadnaught has huge bodies and thin necks. some people may find it uncomfortable(me included).

rm300++ can get you a decent dreadnaught.

the 1st is classical(nylon strings) and 3rd is a grand concert(steel strings).

all of these are acoustics, btw.

yeah, i don't deny that. but to me, comfortability is more important. i can't even play 1 song without any mistake on a dreadnaught, even songs that i know by heart. anyway, to each his own .