I recently took this image of NGC 253 (Sculptor Galaxy, aka Silver Coin) with the iDK 20" in Namibia.
Stacking was done using ASTAP, image processing in StarTools with some additional touches in PS and Topaz denoising.
Lum: 10 x 300s
R: 9 x 300s
G: 8 x 300s
B: 8 x 300s