It's Your House, And Your Life, But...
...Unless you go with a Wolf or a Garland commercial range, you will never again have the rock-solid feel of the range you currently own. Not even a Viking has that bulletproof feel; Viking is pseudo-commercial equipment that is actually pitched to the homeowner market (check this week's TIME Magazine for more info; they have an article about the company). Nothing intended for residential use will be as solid as what you already own, and it will depreciate, not appreciate, in value. You also might like to know that gas consumption is very much higher on commercial and pseudo-commercial ranges than it is on regular home units. The greater heat output comes at the expense of greater gas usage, pure and simple. And you may (or may not) have to beef up the subfloor under the range, to take the additional weight of a new commercial range. It will depend on the weight of the unit you select, the construction of your house, and local codes. Your current gas piping will almost certainly have to be changed, as well. Not cheap.
Also, if you have kids, I have a word of advice on stainless: DON'T. DO. IT. Stainless is for neat freaks, the kind of very clean, very grown-up people who have themselves trained to touch only the handle of the refrigerator, not the door itself, to avoid leaving fingerprints. Stainless shows every last speck of everything, and it can't really be spot-cleaned; you have to clean at least the entire panel where the spill occurred to get an even-looking result. It also shows deferred cleaning very clearly; any hint of grease that has settled onto it stands out like a beacon. I'm just trying to save you countless hours of gritted teeth, with paper towels and Windex (or other cleaner) in hand. If you have kids, you will wish you had never heard the words "stainless steel" within a year, trust me.
That range is just itching to be your friend for life, to turn out years' worth of turkeys and pumpkin pies and fruitcakes and bread and meatloaves galore, to say nothing of soups in that deep-well cooker, and pancakes, bacon, garlic chicken, shrimp with feta, spaghetti sauce from scratch, seared tuna, you name it.