Black and SS do look quite well together. So, if you like it and want it, then by all means get it.
However, I read that buyers tend to perfer all matched appliances, but it probably isn't a major influence.
When I bought my house, it had a white fridge, a harvest gold range, a chocolate brown over-the-range microwave, and a black dishwasher. I still bought the house. But I calculated the cost to replace them and subtracted that from my offer. $2000 later I have all matching appliances, new countertops, new curtains, new lighting, new outlets, new paint, etc. I really like the matching look.
I went with all black because SS was a ripoff at the time (too popular) and it is a pain in the @ss to live with. Dents, scratches, fingerprints galore, not magnetic, etc. After 3 years in the fast food industry trying in vain to clean SS every day, I didn't want to have to deal with it any more.