Do any of you guys have any expreience with the larger size Magnum engines? (1.20 and 1.80 four stroke)

I have a Seagul Super Sport and it calls for a 1.20 to 1.80 two or four stroke. The Magnum 1.80 is $349 and the OS 1.60 is $299. I am undecided as to what engine to get for this plane. I do have three OS 1.20 AX's and love them. This will be my first experience with the Magnum, and my second with a four stroke should I decide to get the Magnum 4S versus the OS 2S.

I am not sure about needing the additional weight. I do need it on my Tiger 120 which is terribly tail heavy (through no fault of mine) and the extra nose weight would be a definite benefit on that plane, however, I am not sure about this Seagul Super Sport.

Any suggestions or opinions would surely be appreciated.

DS.