RE: Good target bow
With respect to the Hoyt line, probably the best hands down, no holds barred spot bow is the ProElite with XT3000 limbs. With an 8+" brace height and it's long ATA (~41") it is a serious tack driver. That being said it is mucho expensive. I think the current price for a new one is around $1000
The UltraElite would be my next choice down. Similar design as the ProElite with the shoot through riser but with a slightly reflexed geometry. Still in the $1000 range.
From there I would look at the ProTec. This bow has the same geometry as the ProElite, but without the shoot through riser. They are great shooting bows. Faster than you would think, certainly fast enough for 3D with the tack driving accuracy for spots.
Then on to the Ultratec. Once again, same geometry as the UltraElite, but without the shoot through riser.
I think the going price for the ProTec and UltraTec are in the $750+ range.
One thing to seriously consider is the limb choice. The bows normally come through with the XT2000 limbs and are in the 37 1/2" ATA range. For a spot bow I would go for the XT3000 limbs which are a bit longer and more forgiving and as mentioned above, but the bow in the 41" ATA range.
Another consideration is the cam choice. If you are not 100% certain beyond a shadow of a doubt what your draw length is (i.e. You have had a coach look at your form, NOT the guy at the shop saying "Your draw looks fine", unless he is a spot shooter as well) go for the cam and a half. They have a 2 1/2" draw length adjustment and will give you the ability to fine tune your draw. If you are 100% certain, then I am a big fan of the spiral cams. They are a pretty aggressive cam, however at the weight you use when shooting spots, they feel very smooth.