be careflull with the wanli, they tend to wear out fast and the side walls will bubble, not sure if its the load capacity that does it or there just a cheap tire but i have seen it happen alot. if its only a metter of 15 to 30 bucks a tire go with a trusted brand like nitto pirelli bfg goodyear and so on and so on
your 265-35 is going to ride a little better because of the larger side wall compaired to the 255-30 also the load capacity is greater too so your tire pressure will be lower for your aplication and give a softer ride
ebay has some good deals on tires and sometimes
www.discounttiredirect.com has some really good specials, just search for the size you are looking for