The 2DS XL would be an absolute no-brainer if I liked the two colour options it comes in (black with neon cyan trim, or white with neon orange trim) but I don't in both cases the four ABXY buttons are solid colours matching the trim. There are a couple of limited edition versions either out or coming out (e.g. pokeball coloured/stickered) but they don't light my fire much either.
My favourite of the current crop, style-wise, is the (non-XL) new 3DS, in a relatively restrained, SNES-like off white with coloured buttons look. but it has been discontinued.
The dark metallic black 3DS XL is probably top of my list now. But there's the ltd ed SNES themed one coming out tomorrow. I think the inside looks lovely but the outside I'm not too bothered about, and it's a bit of a markup on the cost of a regular 3DS XL (and that's not even factoring in the availability of 2nd hand 3DS XLs now).
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The good news, though, is I've played about 30 minutes of Metroid on the SNESc now!