Challange accepted
Without knowing what you have already, I'd say to check out
liberty flights
If you have a smaller sized ecig you'd want something with a decent battery life. We can tell how long a battery will run by using its mAh rating. It's around 100 - 120 mah an hour of use.
A riva or ego starts at 650 mah so you will get a decent battery life. The main difference is the riva is unregulated from 4.2v to 3.2v and the ego is regulated to a flat 3.2v.
Liberty flights also have the epower which is meant to be pretty decent. There's a few good reviews on here somewhere about it. It's like an ego or riva but you replace just the inside battery yourself so it's cheaper to maintain.
They also just got the SD keyring recently which is one of the smallest, more powerful ecigs out there.
The best deal on an ego right now is here:
Electronic Cigarettes - Items - FreedomVape (UK)
You wont find it cheaper than this normally, and now it's 15% off again so you wont find it cheaper than this.
Also from freedomvape on the same page is the lavatube. Currently it's considered the best budget mod out there. Put it this way, you can get the same basic function out of the very best ecig worth £200 out of the lavatube. I own a lavatube and it's pretty awesome for the price, and I have not found it cheaper in the Uk than freedomvape has it right now.
That £200 mod is the provari:
ProVape which is expensive but considered the best ecig right now. Yours if you can afford it but it's out of my price range for sure.
If you want something cigarette shaped and size, check out these guys:
http://www.ivapour-elixir.co.uk/creator-1.html?cat=121 or
http://www.jacvapour.com/ they are THE best cig sized ecigs you can get the in uk right now.
What else to buy, well, without knowing what setup you have I can't really say what parts to buy but I would recommend a CE2:
XL Ultimate Clearomizers - Detailed item view - FreedomVape (UK) these are the same as the "vision" from gotvapes. The latest in the line of CE2s until we get the ?starburst? over here which I don't think will happen too soon.
If you have any problems using a CE2 let me know. I use them daily and have for months with thick liquids no problem. Just takes a very quick modification to work.
Also in the cartomiser line I'd say try out the 2.0ohm boge cartomisers from liberty flights. They'll knock your socks off for throat hit and heat.
I'd give freedomvape's juices a shot. They offer a pick and mix for £12; 5 5ml juices to try out. Best way to check out different juices. Their Ry4, ry4 and caramel, caramel, perique black and mint chocolate chip are pretty good to me but taste is subjective.
There's so many mods and vendors, this is like the shortlist of what I go to, or what the majority use in the uk (save for totallywicked because it's really expensive there). Once I know what you have or what you're looking for I can really tailor a response with what you're after instead of just what mostly gets bought lol