Urmmm...if your ultimate goal is to have an LS/VTEC, then why waste any money on a temporary motor? There's no shortage of LS engines and VTEC heads being sold. Just start putting your LS/VTEC together now.
As for which head is better, that depends on what you're planning to do to the head. If you're going to leave it stock, then obviously a Type R head is better. If you plan to rework it (cams, valvetrain, machine work, etc.) then just buy whatever you can get for the cheapest price...