Monoprice's 12288 earns a #1 powerline adapter rank. But it might not be the right choice for you.
Actiontec's ECB6200 Bonded MoCA 2.0 Network Adapter is the closest thing to Gigabit Ethernet that doesn't require CAT5e cable.
Updated - NETGEAR's FVS336G-300 ProSafe Dual WAN Gigabit Firewall has much improved performance over the original version, with a notable exception.
TRENDnet's TPL-421E2K is a better HomePlug AV2 MIMO adapter than its no-outlet sibling.
TP-LINK's TL-PA8030P 3-Port Gigabit Passthrough Powerline Starter Kit combines performance and convenience in a top-ranked HomePlug AV2 MIMO adapter.
The "fixed" version of TRENDnet's TPL-420E2K no longer tops the HomePlug AV2 MIMO charts.