Most X-bows are overkill.
You'll be surprised by the devastation these weapons posess. Very efficient, quick & clean kills. Most shoot flat out 'til 30ish yards. Loudness is their downfall. Get a quick pointing sight/ Red Dot and get ready to release the "bang from the bow.!":sniper::sniper::sniper:
If I was to buy a new one...... I'd look for solid limbs, a good trigger and quality bolt retention device, once again the noise factor. Durable Limbs are better than busted limbs. They are under excessive pressure.

eepwall:
You can put as much Limbsaver Navcom on, as you can afford, and it still will not be mistaken for the hottest/loudest compound bow around. Those deer are loading up and bounding away as soon as the X-Bow goes off.
I shoot a Darton/Great Lakes Durango 22" bolts, 17"
[email protected] lbs. That's like moose pass through kenetic energy. Way overkill. Deer have dropped in their tracks.
Best Rated in my book....1.Great Lakes/Darton (great customer service), 2. TenPoint (most expensive) 3. Parker (just because I like their stuff, never have shot one) 4. Horton (quality) and Then Barnett (get a newer model) 1B. Excalibur is always rated the best on Archerytalk.com crossbow forums. Let price decide. You get get what you pay for. And X-bows sure cost too much.:banghead:
Bottom line, they have to be close in my experiences, and that's the best part.:wink4:
You'll love it, and any weapon that can put you in the woods is a honorable weapon.