A 17 inch Dell CRT is probably worth at most $25 if you can sell it locally. You won't be able to sell it for a profit if you have to ship it. I could get my hands on 20 free CRT's if I wanted, they really don't have too much value. People upgrade to LCD displays quite often and can't store the CRT or they can't throw it out due to environmentally regualtions. So people will just give them away when they upgrade.
350 Watt Sparkle Power PSU \ Asus P4P8X SE \ Pentium 4 2.4 GHz (OC to 2.99 GHz, 166 MHz FSB) \ 2 x 512 MB PC3200 Corsair XMS running in dual channel (what a waste of great RAM being underclocked) \ ATI Radeon 9800 Pro\ ATI TV Wonder Pro \ Turtle Beach "Santa Cruz" Sound Card \ Creative Labs Inspire 5.1 5300 PC Speakers \ WinXP Pro