You should like at either QFX5100-48T or EX4300-48MP.
EX4550 goes End of sale in June 2019 (3 months away) so not a platform I would avoid this platform.
QFX5100-48T has 48 x 100/1000/10000 Mbps RJ45 ports and 6 x 40G QSFP ports.
EX4300-48MP has 48 ports where the first 24 are 10/100/1000 Mbps RJ45 and the last 24 can run 100/1000/10000 Mbps RJ45.