Welcome aboard!
I don't know what your budget is, but for about $100 more, if you go to either gunbroker.com or auctionarms.com, you will see that gunfinder has a Tikka in Stainless/Synthetic for $483 and that's one heck of a price! I don't know if they are still for auction, but if you find them, then you should definately get one!
After a short time on this forum, you will quickly learn that I am a very big fan of Tikkas rifles. They are made in Finland and have excellent quality and accuracy. In fact, many of our members have purchased Tikkas at my suggestion and everyone has been very pleased with them.
As for the Vanguard - it's essentially a Howa rifle, which isn't necessarily a bad thing, but don't think that it's a full-blown Weatherby either. As for the Ruger - I am not a fan.
I own Remington 700s, Wichester 70s, Browning A-Bolts, Tikka Whitetail Hunters, and Sako 75s. I have not yet received my Sako, but I have shot many of them and love them the most - but they are expensive at about $1,000.00. A Tikka is essentially a lower priced Sako - competing with the Remington 700s (which are my next choice).
Zachary