Mate don't think you could go wrong with a second hand tikka. As for the spotlight I use a Olight mxu-3 javelot with a magnetic barrel mount clips on and off in seconds and easily handles recoil of my .270win it was about $260 (from memory) it's up there in price but easily shines out over 400m with naked eye and I can identify roos through my scope to an easy 500m and take the shot. A .223 will be an easy calibre to find ammo for and plenty of options available, can't go wrong really. What's your target species or even shooting objective (target/longrange etc)?? That will determine your calibre selection more than anything. I went the .270 as it was minimum legal for all deer, flatter than 30-06 and quite a versatile round as I use 110gn projectiles for small game. If I was just after foxes/rabbits a .223 or my next purchase may be a .204.
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