The XTi with the kit lens isn't worth too much now...seen them on CraigsList for $300 or less. Most accessories don't hold their value. For the RC-1, batteries and CF card you might get $5 for each item (maybe $10 for the RC-1). The 420EX isn't that popular and I've seen them on CraigsList for about $75. Since you can't adjust power most strobists will pass on it. Not sure what the Tamrac would go for used.
Of the lenses you listed, the EF 85mm f/1.8 USM would be the most desirable. You could get $300 for it. Then maybe the EF 50mm f/1.8. Which version is it? The one with the plastic mount or metal mount? The other lenses won't get you much. The EF-S 18-55mm kit lens sells for $50 to $75. The EF 75-300mm sells for about $100 if you're lucky. Not sure what the EF 28-80mm would go for.
If you sold everything together as a complete kit I think you might be able to get $900 to $1100. You might get more if you sold everything individually.
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