I suggest you read the “Why a 600cc Motorcycle is Not a Good Beginner Bike” Guide on this web site.
Do yourself a huge favor and get a used 250 c.c. Honda Nighthawk or similar for your first bike. If you simply must have a bigger bike than that, consider a Suzuki Savage (renamed the Boulevard S40), which is cruiser styled, 650 c.c. and very light weight.
Believe me, those bikes you’re talking about are far too heavy for a beginner to handle.