My first box was an olde Sig 100W, rarely had her over 45W for the first couple of months. Even after the few room filling goes at 70+W still had her running at 40-50W the rest of the time.
Having the extra power was useful and think of it, whatcar is happier at 70mph? A Jag that can do easily 160 or a wee fiat that can only do 85max?
Don't stint, get the $40 Ipv 4s!!!