1. a
2. I can't really afford for now either a bigger monitor or a better vid card (currently ti4200 128MB with slight o/c). But if I were to upgrade to better vid card (such as 12 pipe G7x) I'd get a used 21" IBM CRT.
3. IBM G76 (8648), 17" CRT really nice looking (excellent colors), 1152x864@85Hz (I don't go higher res, going below 85Hz sucks, it does 1600x1200 60Hz), not trinitron/diamondtron so no annoying dark lines, not quite flat but I love it as it is.
planning to use a second 17" CRT which'll be probably plugged on a Banshee PCI (no dual head on my gf4).