As a new paddler myself, I think it all depends upon the conditions you paddle. If you're paddling true ocean conditions, with lots of chop, waves, etc. I think that V8 Pro will do you well for quite some time. In flat water/very mild ocean conditions, I am roughly .5 - .6 (1km) mph faster in the V10 Gen 2 than than when I paddle the V7. What was a hard tempo pace for 1 hour when paddling my V7 in the ocean (9 min/mile) is now an easy pace in the V10. When paddling the V10, my 1 hour tempo pace is now down around 8:20/mile, and I suspect that it will drop even lower as I become more stable in the boat.
Now, that being said, if I had a race tomorrow and conditions were going to be rough, I'd MUCH, MUCH rather be in the V8 Pro, as I'd be MUCH, MUCH faster! I am simply not ready to race anything but flat water in the V10... right now.
As a beginner, if I were rich, I'd buy a V8 Pro for really rough seas, surfing, etc. and use the V10 as my flat water boat. I would then gradually push my limits in the V10 over the course of the next 2 - 3 years so that I could eventually paddle it fast in all conditions. Truth be told, if I sell a mountain bike (or 2) I might just buy both boats and follow this plan. As it stands, I can only afford one, so I plan on building into the V10 by gradually introducing rougher sea paddling into the mix (I'll use my V7 for surfing and the really nasty stuff this fall).
As another point of reference, one of the local guys I race with paddles a V8 Pro. He has really come on strong in the later part of the season and is averaging right up around 7 miles per hour for his 8 - 14 mile flat water and flatter ocean races! The boat can definitely move, and is a very stable platform to boot. Is the V10 faster? Absolutely... as long as you have the stability to paddle it hard in the conditions you plan on racing. I'd still be faster in my V7 on a rough day in the ocean simply because I wouldn't be capsizing left and right, but I'm making the commitment to paddle the V10 every outing and gradually building my skill set. Like you, I'll get there eventually.
Hope that helps.