mikew welcome to the forum. I think you will find alot of educated answers to your ?'s here. Feel free to ask any and all that you might need to, to be able to make a good choice for you.
I do not know much about tenpoint crossbows, other than they are alittle more narrow, but they will weigh more.
Now the Excal line of crossbows are simplistic in nature. No pullies, can change strings in less than 5 minutes. I have watched someone cock 175lb bow, one handed with the help of the cocking aids. These bows also can be attached with a mechanical cocking device, weither it be the Excal "crankaroo" or the acudraw.
Any Excal bow will be enough power for deer, even the 150lb model is enough for Moose, but I would recomend going higher poundage if you plan on the larger game animals.
Now between the two exocets (175 & 200lb), if I am correct, the only difference in the two is the riser. The 200lb has the forward tilting riser creating the extra poundage in the bow. Both will be dependable and accurate.
gentleman with whom I spoke favors TenPoint; claims they are more durable.
I find to be maybe a sales pitch. I shoot the Excalibur Relayer which is over 20 years old and have never had 1 major problem with it. The more simple the design in genereal, the less problems you will have. I am not saying that TenPoint is not durable, but only that the Excalibur crossbows are one of the most Durable and Reliable on the market, and if you ever do have a problem, the company stands behind their bows. Others on here can attest to their dependability.
Hope this helps.