So, I'm stuck in the house today with a ferocious thunderstorm rattling the walls. This got me to daydreaming about my next saw purchase. Here's the background. I already have MS361 and MS461 with 20, 25 and 32" bars and chains. Want something for really heavy-duty work in Eastern hardwoods (Oak, hickory, beech, etc.) like bucking 25" logs, stumping and milling flitches up to about 30+" dbh. Thinking of MS661R vs. 390XP vs. other? So let's here some opinions. Of course, used will always be the best value, but let's stick to NEW. FWIW, it would easier to plug in the 661 since I already have multiple bars. Also, my local Stihl dealers are more likely to haggle on the price and are a little better at service. That said, I have no specific brand loyalty and would be open other brands if obviously the better choice. Discuss...