Another Heavyweight returning to Cycling!

Hi i'm from the South
Decided to sell my car recently and downgrade to something a little cheaper, leaving spare cash for a bike.
I'm currently around 20st and a whopping 6' 8", which i forsee to be an issue in finding the right bike!
I've been reading as much as i can the last few days on various sites and come up with the following ideas, my budget is ideally £300-400, i would consider spending more for the right bike.
The last time i was riding i was into GT's, it was much simpler in those days, LX, DX, XT, XTR pretty much summed up the popular groupsets, i think discs brakes were just coming in but i was using V-Brakes and i never used suspension before.
I found the following bikes:
Giant Torrago 2009 here.
Kona Fire Mountain Deluxe 2008 here
They both seem to have very good equip bundled in for the price, best Value for money.
I will consider other bikes though on recommendation.
My size is going to be a big factor in deciding so i need to know if i should be using a 21"/22"/23" frame, for riding on Roads/Offroad in a few weeks as i get fitter.
I was told by someone if i should drop down a size for riding offroad to be more agile, is this true?
I think that sums up my questions for now, thanks
Decided to sell my car recently and downgrade to something a little cheaper, leaving spare cash for a bike.
I'm currently around 20st and a whopping 6' 8", which i forsee to be an issue in finding the right bike!

I've been reading as much as i can the last few days on various sites and come up with the following ideas, my budget is ideally £300-400, i would consider spending more for the right bike.
The last time i was riding i was into GT's, it was much simpler in those days, LX, DX, XT, XTR pretty much summed up the popular groupsets, i think discs brakes were just coming in but i was using V-Brakes and i never used suspension before.
I found the following bikes:
Giant Torrago 2009 here.
Kona Fire Mountain Deluxe 2008 here
They both seem to have very good equip bundled in for the price, best Value for money.
I will consider other bikes though on recommendation.
My size is going to be a big factor in deciding so i need to know if i should be using a 21"/22"/23" frame, for riding on Roads/Offroad in a few weeks as i get fitter.
I was told by someone if i should drop down a size for riding offroad to be more agile, is this true?
I think that sums up my questions for now, thanks

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Posts
I am only 6' but I got a 20" frame for my GT and it felt a lot higher than the Scott I had before but after a few rides I feel more than happy with it.
But anything bigger and it might be a bit difficult to throw around, but as said above, try before you buy!
I have not found a store that stocks the Terrago yet, makes me wonder why its not a popular bike, the spec seems pretty nice, i know its srp £500, but most shops seem to sell for around £370
Graydawg
I did try the Trek 21.5 today and would agree it feels quite large, i doubt i would want to go any higher in size, i think i have found the shop now to buy from, i just need to decide on the bike
I ended up buying a Commencal Normal Disc, i'm sure you guys/gals know the specs of the bike
The store i bought it from was very helpful, gave me loads of information and did not force an upsell on me as soon as i walked in.
I have been out tonight for 5+ miles, it might have been more, i met my match at some of the hills, and had to dismount and walk half of the last one. (damn i don't remember it being that tough to cycle up a hill) :P
Later i will plan a flatter route for the rest of the week to ease myself back into riding, for now i think i'll hold off hitting some of the offroad stuff until i sort my general fitness out