I prefer Nikon's ergonomics to Canon's, and imo their menu system and controls are far more user-friendly.
You mentioned lenses, and as it happens I was talking about lenses just last night with my local camera store. The clerk there was quite dismissive of Canon's low end lenses: they make excellent high-end lenses, but below a certain price point, their lenses are garbage. Nikon, OTOH, makes good lenses at every price point. So while Canon lenses might be cheap compared to Nikon lenses, they're not nearly as good.
That said, Sigma and Tamron both make excellent third-party lenses. 🙂
I'd buy the Nikon, because I prefer them. But there's nothing wrong with Canon's offerings, either.
(prices for europe, in euro)
Decent Kit EF-S 18-55mm 3.5-5.6 IS < 100
Good 50mm 1.8 < 100
Hyped but still fine EF-S 55-250mm 4.0-5.6 IS < 200
Very good 35mm 2.0 < 250
Decent EF-S 17-85mm < 300
Very good 50mm 1.4 USM ca 300
Excellent EF 85mm 1.8 < 350
Excellent EF-S 60mm 2.8 Makro < 350
Excellent EF 100mm 2.0 ca 400
Decent EF-S 18-200mm 3.5-5.6 IS < 400
Good EF 70-300mm 4.0-5.6 IS USM < 450
Excellent EF 70-200mm 4.0 L USM ca 550
Excellent EF 15mm 2.8 Fisheye < 600
Very good EF-S 10-22mm 3.5-4.5 USM < 700
Good EF 17-40mm 4.0 L USM < 700
Excellent EF 200mm 2.8 L II USM < 700
Very good EF-S 17-55mm 2.8 IS USM < 900
Very good EF 24-105mm 4.0 L IS USM < 1000
Excellent EF 135mm 2.0 L USM < 1000
Excellent EF 70-200mm 4.0 L IS USM < 1000
Very good EF 70-200mm 2.8 L ca 1000