Loves me them mid-80 Raleighs. You'll find they don't get much value placed on them around here though.
The Grand Prix was the entry point to Raleigh USA's 4-model racing lineup in 1986. Front triangle is Reynolds, stays and fork are chrome-moly. Yours appears to have the original 105 group intact, looks very clean and ready to ride.
Normally I'd say $150-$175 figuring it would need consumables but I'm going to assume yours is ready to roll and could possibly bring $200. I've seen these sit on CL forever at $250 so can't really see it going any higher.
Hope this helps.