if you can afford it, go with the V&H short shots staggered. they look good, sound amazing, and relatively cheap. If you go slip on route I would say either of the V&H slip ons you mentions would be good, they should sound similar so it really gets down to the look you want. Exhaust is a big change, I would say save the money until you can get the exhaust you want. If you want a set that costs $700 but can only spend $400, save the money instead of spending $400 now and saving again until you get the set you want. $700 is much cheaper than $1,100 if you do the step up process.