As a general rule you'll pay a little more for a custom bow but I'd take the term "custom" with a grain of salt. While most offer a fairly wide range of riser woods and veneers to choose from, the designs are usually what they are in regard to the actual finished product- a basic handle shape and design, shelf height, etc. Some, like Morrison and Blackwidow offer different grips from which you may choose and some, like Border Bows of Scotland and Blackwidow here in the U.S. will offer to duplicate the grip of your current favorite and incorporate it into their basic design. You can find custom models available for around $500.00 to $600.00 up to $1500.00 or there abouts. I would recommend that you look long and hard at what's out there. Even though I don't own or shoot a Martin I think they are definitely worth looking into if actual value -quality, warrenty, performance weighed against cost- is a determining factor in your final selection. Seventy pounds is really not that heavy and most bowyers or production companies would turn one out for you. You might also talk with the folks at Bob Lee- I consider them excellent bows, especially for the money. and Bob Lee has been building great recurve bows as long as anyone around with the possible exception of Owen Jeffery. Seventy pounds will have a smaller market should you decide you don't like the bow you buy, especially in light of the fairly recent trend toward lighter bows, so I would suggest you actually handle and shoot as many bows as possible before you settle. Even if they are lighter than your ideal setup you can decide if you like the way it feels to you and simply order a heavier draw weight. The bows I mentioned only scratched the surface of what is available currently and represent what I think are good values. There are more bows to choose from right now than I can recall in over forty years of traditional archery. Good luck.BTW- you might check our classifieds as well as those on other sites. Grant