I've always felt that what I had, whatever I have, is ideal....by which I mean, the setup that would best fit anyone, not just those with deep pockets...
so for now this is my ideal digital lineup:
Canon 18-55mm IS (what a bargain...better than the 24/35 Nikkors it replaced)
Vivitar 28/F2 (stuck at 2, but that's where I'd be using it)
Canon 35/2 (equal to the best of 50/2 lenses sold with 35mm SLRs)
Canon 50/2.5 CM (great for the occasional real close-up if not real macro)
Nikon 50/1.4 AIS (a perfect, maybe THE perfect crop/bod portrait lens @ under $125, or $25 if you're lucky.)
Nikon 50/2 (a nice compact/sharp...@ F2...travel lens)
Canon 70-210/3.5-4.5 (like the 18-55IS kit, a zoom for all occasions and at under $150, for all budgets)
Nikon 85/2 (it's the ideal compact for low light shooting....okay, after 20 years, I'd like to get my 85/1.8 back...larger/heavier and now I don't need the lighter F2)
NIkon 105/2.5 AIS (the classic, enough said)
Nikon 135/2.8 AI (well, AI optics, not cosmetics, so it was cheaper)
Nikon 180/2.8 P-C (AI optics, not cosmetics, so ditto)
Nikon 200/4 (the AIS would be nicer, (lighter, smaller) but this holdover from 1971 is still sharp)
Nikon 300/4.5 AI (not the ED but $200 less so what's to complain about when you're shooting such a lightweight compact 480mm crop @ 5.6)
The G3 with its 35mm equivalent 35-140/F2 is a very nice, if not ideal, walkaround.
My Canon kit 450D/s90; Canon lenses 18-55 IS, 70-210/3.5-4.5....Nikon kit: D610; 28-105/3.5-4.5, 75-300/4.5-5.6 AF, 50/1.8D Nikkors, Tamron 80-210; MF Nikkors: 50/2K, 50/1.4 AI-S, 50/1.8 SeriesE, 60/2.8 Micro Nikkor (AF locked), 85mm/1.8K-AI, 105/2.5 AIS/P.C, 135/2.8K/Q.C, 180/2.8 ED, 200/4Q/AIS, 300/4.5H-AI, ++ Tamron 70-210/3.8-4, Vivitar/Kiron 28/2, ser.1 70-210/3.5, ser.1 28-90; Vivitar/Komine and Samyang 28/2.8; 35mm Nikon F/FM/FE2, Rebel 2K...HTC RE UWA camera