These are the folks I use for tires. Their prices are reasonable and their shipping is very quick. This year I purchased tires for both my Magna and my Valk from them. Besides the quick shippment they had excellent communication by email of my order details.
http://www.motorcycleproshop.com/tires/dunlop/honda.aspOn the Magna I run the Dunlop 555 series which is the stock tire and get between 12K and 13,500 on the rear and around 15-17K on the front. This last set I had mounted in March I had the Dyna beads installed to balance the tire. Now after about 3K the tires are still perfectly balanced and smooth. The tire pressure I run is mid way between Honda's recommended pressure as noted on the bike frame and the max tire pressure noted on the tire.
By the way, I have had four of the last generation Magna's and my current one a 2001 is my daily rider. I run them up to around 80K then sell and find another low mileage one. My riding is mixed between local and trips less than 150 miles one way. My Magna is used year round but almost exclusively in the summer months because it does not have a windshield and does not put out as much heat as my Valk. In a race, if she cranks on that Magna and gets it up on the cam which happens around 5,000rpm and she shifts around 9000 she'll burn you up till around 80 mph then you'll catch her. The rev limiter kicks in around 10,200rpm but by 9500rpm you are past the peak HP and torque curves so you're just over revving at that point. She'll also loose you on the tight twisties.
I use the Saddleman seats on my Magna and IMHO, find them to be much better than the Mustang seats. I have ridden as much as 550 miles in one day and 2200 miles on one trip and while it's no where as comfortable as the Valk it's not a bad ride because of the smooth engine.
The only weak link in the Magna is that you MUST lube the chain at least every 1000 miles and that spray stuff they sell is junk. Using that stuff you'll be replacing the chain every 20K. I lube every single link of the chain on both sides of the roller with 80/90 weight gear lube then I let the bike set over night before riding it. This is Honda's recommended practice and in so doing my chains usually last 45-55K miles. If I can, I wipe the excess off before riding it but usually don't have time to do so and it will spray over the back wheel. I then clean that mess with Windex.
Check out:
http://www.motorcyclecruiser.com/roadtests/honda_magna_750/index.htmlYou can contact me off board for more info if you wish.