I've never used Magnum or First Gold. However reading up on it I see Magnum is a bittering hop not unlike Willamette, so I'd go that as the bittering hop. Target was originally developed as a high alpha bitterer but is a so-called 'dual purpose' hop and often gets used for aroma nowadays. However it's 9% AA so be careful. I used it as the bitterer in a Modern Summer Ale that I put in a comp and it got criticised for being too bitter. So go easy on it and as Fourstar said, add it later in the boil. If super Styrians are anything like the normal Styrians, then a good aroma hop. Basically what Fourstar said.
First gold is a Goldings Cross, I'll get round to it eventually.
So many hops so little time :lol: