It's the Yahoo LTspice user group, just look it up under Yahoo groups. Far as I know all LTspice opamp models are behavioral based so the oddities of the actual silicon won't show up, good luck getting a 'true' spice model of an opamp. Using the basic opamp model and then testing the real circuit is really your best option, simulators just don't cover everything that come up, like component placement and odd parasitics that might be present. Look through the LTSpice help file and the generic opamp model, it will have a list of all the paramaters you can specify, with the white sheet for your opamp you can build a model for your opamp as good as you'll find anywhere else.