Greenhouse v Poly Tunnel v DIY project advice please!!

Hello everyone - I am in a bit of a quandry and wanted any advice or experiences that might help me.

Basically I started off about 2 weeks ago thinking that I wanted to buy a new greenhouse. I dont have a huge amount of money spare so initially I scoured ebay, freecycle, etc but havent yet turned anything up at a real knock down price.

So last week I kind of decided that if a second glass/aluminium greenhouse was going to cost close to £100 (plus time and effort to dismantle and collect, arranging transport, petrol etc) then I might as well get a new PolyCarbonate greenhouse which can be delivered for about £150 i think.

Then over the weekend I was looking over my garden, and with a bit of heavy pruning and relocating my chicken run, I realised that I kind of have an ideal area for a small polytunnel and looking at prices on the internet I could get something delivered for less than £250, which is really more than I wanted to spend but could be worth it overall.

Finally in the past few days I have been looking at various ideas and instructions for building your own polytunnel using scaffold poles, water pipe and so on. However by my rudimentary calculations even blagging a lot of the materials, it is going to cost well over £100 just for a decent cover plus a lot of labour time.

So to sum up - ideally I would like to spend not more than £150 on something and want to get the best return for my money. I have a smallish vegetable patch at present, so what I really want is somewhere to house my seed trays and to house some of the more "hot house" vegetables - chillis, peppers, cucumbers, etc.

I would appreciate any reviews or advice on Poly Carbonate greenhouses - are they easy to construct? How good are they compared to traditional glass? How much can you get in them? Any top tips on the best place to buy?

I would also appreciate any thoughts on Poly Tunnels. How much does it really cost to build your own, and is it worth the extra money for a "professional" one?

many thanks for any advice

Chris

PS I'm in sunny South Devon if anyone has particular advice for anything in the area

Got to agree with last reply totaly. We have just had the worst week of winds in the 4 years that i have had mine [60mph]. Apart from flying debris which as caused some damage they are very strong. A roll of repair goes along way. Fellow plotholders have been replacing glass and polycarbonate sheet all week and the costs have amazed me.
I got mine from first tunnels first class service and instructions. Which i followed to the letter.I did bury the plastic never again base rails are the way to go but this dose add to the cost. Very cost effective for the size £399 for a 25x12 cost glass/polycarbonate to cover that area but sit down first.