Then I'd suggest the Nikon lineup, rather than the 350D. AIUI (and please bear in mind that I'm only really familiar with Canon, being a Canon shooter myself), if you compare the rock bottom lens lineup of the two companies, Nikon does a better job than Canon. Canon's cheap lenses are just that - cheap; in comparison, Nikon's cheap lenses are actually reasonable quality. Not top, pro grade quality, of course, but decent for the price, although you pay a bit more for them than you do for Canon's.
Your whole post is full of misinformation and opinions based on nothing.
If you compare the 2 18-55 kit lenses from Canon and Nikon, the Nikon is a bit better since it is more contrasty. The Canon one has less distortion though. But what other rock bottom lenses do you mean?
Only the 55-200mm lenses spring to mind, and the Canon lens, while constructed a bit awkward in comparison, is optically a bit better. The Canon EF 75-300 also is better than the Nikon 70-300 G, both in optics and construction. Both the Canon 28-105mm f3.5-4.5 and the Nikon are quite good, the Canon having the edge with its fast accurate USM and colour reproduction.
The only 2 lenses I can think of where a Nikon actually has the edge is with the 50mm f1.8's where Canon's version is considerably cheaper, and that shows in its construction, and Canon's 17-85mm IS USM, that disappoints a bit optically in colour and contrast.
So, what rock bottom lenses remain that make Canon lenses just cheap in comparison? Your opinion seems not to be based on knowledge of the matter.
What about middle end lenses? Here actually Canon has the edge. Just compare the Canon 70-300 IS USM with the Nikon 70-300 VR. In optics the Canon is a lot better, in build quality it is at least as good if not better.
Canon's 85mm f1.8? Great build quality, as is the Nikon 85mm f1.8. Both great optically.
Canon's 10-22mm f3.5-4.5? Constructed very well... as is Nikon's 12-24mm f4. Both very good optically.
Their 50mm f1.4's? Good construction, the Canon is the sharper of the two.
Then there is of course the Canon EF 70-200 f4 L, which has great build quality and optics, and no equivalent on Nikon. And the Nikon 18-200 VR, which has a convenient focal range, but optics and build quality are not all that impressive.
At the top end, there's not much between them, enough that if you want to spend the money on the glass, I'd not seriously recommend one over the other.
Depends on what lenses you look at. Canon's 85mm f1.2 USM II beats Nikon's 85mm f1.4 in just about everything, but it costs more. While Canon's 100-400 IS USM zoom has its faults, it is miles better than Nikon's 80-400 VR, which performs very disappointingly at 400mm.
Canon's EF-S 17-55 f2.8 IS USM is very sharp throughout its total range, where Nikon's 17-55 f2.8 DX loses resolution towards the long end. And the Canon includes IS, for a slightly lower price at that.
The 70-200 f2.8's from both companies are very good, as is the 70-200 f2.8 from Sigma. Both have good macro lenses and long primes.
As for the 350D, it's not a particularly well constructed body. Any heavy lens (like the 70-200mm f/2.8, or the 100-400) feels like it's about to snap off when mounted on that body. The smaller lenses are fine, but it's not as solid as I believe a DSLR should be. The 400D seems to be a massive improvement in that regard, at least.
This is just not true. The 350D is just as well constructed as the Nikon D50/D70/D80, and can handle long tele lenses well. Just because you do not like how the plastic may feel does not mean it is not well constructed.
There is no difference there between the 350D/400D and the Nikon D50/70/80. And where you get that the 400D is a massive improvement is a mystery, both are totally similar.