I used to use the KR808 but now I have an Ego and a mini reo..I love them both. I work 12hr days and they both last. You will not go wrong with either of those.
"What kit should I buy?"
-the perfect kit, its perfect
-get the perfect, everyone else has one
-have you looked into the perfect?
-buy a perfect
-i'm happy with my perfect
How boring is THAT?
I started with the 808, soon upgraded to the Riva and never looked back. I don't consider the 808's a waste of money because they introduced me to ecigs. Liberty Flights has Riva kits for only $30 after the 20% discount. Pickup a 15 pack of Boge LR (2.0 ohm) cartomizers from crystalclearvaping.com for $20 and free shipping. You'll be good to go for quite some time. It's an incredible step up from the 808 system.
Also get a drip tip or two. That way you can try dripping onto the atomizers that come with the Riva kit. Plus drip tips are great with cartomizers, way better in the mouth than the end of a carto.
If you are at all handy and think you can solder, you can build a 3.7V boxmod really easily and cheaply. I went 808D to a 14500 3.7V boxmod with 808 connector. With my 808 cartos on it, the vape is virtually identical to the 808 experience only without the constant recharging. I take a fresh batt when I go to work in the morning and it will get me through until I get home at night (I do toss in a fresh one at that point, so about a batt and a half a day for me).
Parts can be had for less than $10 and if you do it simple it's a little drilling and three or four solder connections. I actually prefer to leave out the LED and just go bare bones utilitarian, but that's my style with most things.
I would go with the Echo 1300 or 650 they come with a great 3.4 ml carto and you can also use your 808 cartos for testing juices ect. Cropduster has a great buy on them right now. 44.95 for the 1300 or 39.95 for the 650. Cropduster901!, Home of the B-52
This is the day the Lord has made I will rejoice and be glad in it!