The PSU end of the power cord is a standard IEC-13 connector. The wall end.... depends on what country you are in. There are a lot of flavors for the >200v plugs.

To be honest, there's good and there's good enough.  In my eyes, mining is still a business, so keeping costs in check is important.  Why pay $300 for a PSU when $120 for Bitmain's (or $85 in the case of my IBM 2880W PSU's) will do the same job adequately and reliably? The more you spend on PSU's, the less you are able to spend on miners, plain and simple. Anyone that tells you otherwise either has constraints limiting their choices (<200V AC input or require SATA/ATX plugs for motherboard), has made a hobby of it and wants to show off their bling, or are delusional. The only other factor to take into consideration is PSU efficiency, and if at your given electricity rate the extra cost for a more efficient PSU is worthwhile in the longrun.

The wall end also can depend a lot also worth mentioning a lot will change based on what PDU you use (assuming you use one).  Not all PDU's use the same connector going into them so it's worth looking at when buying a PDU.   I personally have PDUs between miners and wall in all 240 connection's I have.   

It is worth noting you can find some decent to great deals on PDU's on ebay from time to time.  I owe phil for one he told me about once.   But if your ever in market for PDU check ebay a lot as it tends to change on what is best deal.