I have the same setup and considering between two Netgear models, the GS724AT and GS724TP. Both are 24 port "smart" rackmount switches. They cost from $360 for the GS724AT and $600 for the GS724TP at Newegg. They both support jumbo frames but otherwise I'm not clear on their differences / benefits.
I recommend keeping with the same brand of equipment for the READYNAS and switch. Hope others can shed some light on your request.