mddoss,
You can get Gold Tip Pro Hunter 5575's for just under $100 (barely)that are very straight and are 8.1 gpp and worth the money.They are by far the thoughest arrows I've used. The Gold Tip XT hunters are not as straight per dozen and $20 cheaper. The 5575'swere perfectly fine for my buddy and his Matthews at 62 lb and a 29" draw with a 28.5" arrow w/ 100 gr tip.
A 300 spine would be way too stiff for your set-up and a 340 probably would be too. Arrow length, tip weight, wrapswill dictate spine along with the draw weight and draw length.
If you have a basspro around you can get them thereor order from either one of the places listed below. They are both excellent with customer service and the guys at Lancaster archery are very good.
www.lancasterarchery.com
http://www.bowhunterssuperstore.com/