The Tamiya F-15E has much better detail and fit than the Revell kit, but is a bit more expensive. There is a ton of aftermarket, which you note you don't want to take on, but some is helpful in that it removes the need to sand inside the intakes and exhaust cans which is a big pain. Now talking about big, the SU 27 is humongous! It has some accuracy issues. but goes together well in my opinion. I have built the Tamiya F-15C and enjoyed the build. Look around for some reviews online.