I agree with Solotripper, I'd spend less on the tents, particularly if you are not likely to be using them a lot in the future.  A tarp is good to have and will let you get away from the tents to cook, or whatever, and still be under cover.  It is good for shade, rain, and also can make an effective wind break.  Remember plenty of rope.  An inexpensive poly tarp, or even Tyvek or plastic can work for the tarp; after all, you may not need it.
I have owned several Eureka tents of different models.  All seem to be very well built and the prices are reasonable.  All tents will degrade if left pitched in the sun for extended periods and eventually get fragile and may easily rip after several seasons.