You have your budget and buying bigger May not fit in right now but as many have stated settling for a smaller unit isn’t going to cut it in electronics. Small units will do some of the same things big units will do but the detail in the picture will be hard to decipher. Therefore bigger is better. Not everyone can afford a thousand dollar unit but if you want quality, find a way to go bigger. I have twelves on my boat but I’m old and retired now. I can afford them now. Couldn’t afford them while raising my family but they’re all grown now.