Square necks are generally used by Dobro and Hawaiian style players. Round necks are usually prefered by the blues guys and bottleneck sliders. But the advice to play before you buy is excellent. As to the brand, I didn't know that Fender made a resophonic guitar. I haven't been wiped out by their accoustic flat tops tho' I'd look into Regals for a good price, old National round necks if affordable because they are the best that everwas. And any number of others that sound and play good no matter the name or the price. Quality is always apparent and each instrument has its own unique qwerks and beauties.

Don