you need to know magnitude of currents before you can pick connectors. i was using MiniFit Jr on some applications and they worked well. they are rated for some 10-13A, but also survived a lot of abuse quite well as long as they were not connected/disconnected under those conditions (for example tested occasional excess current that was twice the connector rating for couple of seconds, wires would start to melt but not the connectors). if you need higher current, you can always parallel pins to share current (see derating instructions). when assigning pins make sure that high current contacts are far from each other or you have to derate. also important is to look at your PCB. unlesss specified explicitly, PCB manufacturers will assume that your designs use 1 or 0.5oz/ft^2. depending on width of your PCB tracks, you may need more than that (2,3 or even 4 oz/ft^2) or multilayer board (inner layers can carry less current because they are enclosed and don't get cooling). most PCBs are at least 2 layers so be aware of current capacity of both tracks and vias (you can place several vias near each other to get better connection between tracks on different layers). if you can take a look at existing designs (pcbs with 6 or 8-way switches in power seats are designed just as i described, they use high current switches, multilayer boards with lots of vias and blade style high current Alps connectors)