An upside is that no fee is applied for exceeding your credit as long as you bring it back within your credit limit within a reasonable time. You can only use this card on QVC purchases, and as with many store credit cards, no cash advances or balance transfers are available. Returned payment fee is $29. Late payment fees will depend on the size of your balance, and vary between $15 and $39.
If you may want to set up a Dressage arena inside your regular arena, that requires more length. A small dressage arena is 20X40 meters (or about 66 feet by 132 feet), a large dressage arena is 20X60 meters. A standard size competition arena is about 100'X200' and is large enough for full jump courses and other uses. Also consider the fence material.
The minimum width for an indoor riding arena is 60'. Anything less is probably going to be too small. The average width for an indoor horse arena is 70' to 80'. The optimum length can vary widely depending on your discipline; however, covered riding arenas falling within the 120' to 250' range are the most common. Standard interior height is 16' to 18' to the top of the trusses.