Iliija,
Price is good for such a big amp though I am not a big fan of Peavey sounds.
Are you ready for physical challenge of having to haul 81-lb (36.8 Kg) Peavey KB 300 every time you gig? Although my Roland KC-500s sound good and have wheels for easier moves I nolonger am willing to move these 78-lb amps by myself. Fender has a fantastic stereo keyboard amp SFX 200 but it weights 82 lbs. I think that a keyboard amp without wheels weighing around 40 lbs (18 Kg) is about the heaviest portable ones that make sense to me. My experience with keyboard/keyboard amps is that every pound/kilogram beyond the 40 lb/18 Kg threshold actually make you feel that it is much heavier than it ought to be. I think the design of Samson EX-30 makes a lot more sense to me (with extended handle, wheels and option for battery operation) - but it is much more expensive than the Peavey KB 300 that you can get.
Good luck on your keyboard amp hunting,
Paul Ip
from Texas