I don't see why a W95 PC shouldn't connect, as the internet connection is dependant on a suitable browser and TCP/IP protocol support, which isn't really dependant on OS ( I know you can't use IE6 on W95, but doubt this is relevant ). The operating system itself shouldn't matter.
The Dell Dimension 3100c system is available with screen for £299, but you have to remember to adjust the warranty to "Collect & Return, 90 Days Service only [Included in Price]" They default the warranty to a more expensive option. The Dell™ 15" Value Flat Panel monitor is included in the price. click here