I.G.B.:
Take the plunge. These rifles are worth the $200 or so.
Even if what you buy turns out to be not exactly what you want, different stocks are readily available, and you can have the factory fit one or more new barrels for a reasonable cost. You can then sell the old components for a decent price.
As far as Ultra/Handi/Survivor, just buy the configuration that makes the most sense to you. The only differences are in the stocks, the barrel lengths, and the available calibers.
Mainer