if you want a normal one just call in at quickfit, horrible place but open convienient hours, i found to be the cheapest for my 1.6 and they come with a 2yr warrenty, most places only give 1yr
Fastfiat do though? You'll find they're all pretty expensive for HGTs though, that's just part of the pleasure of having one!
Try Angel Tuning aswell for a supersprint system, Ozric-Al had a supersprint from there last week, and Nige gives discount for Boo members too, I do believe! (Still not exactly cheap though!
Just wait til you fit an induction kit! The HGT's growl is like nothing on earth!
Supersprint exhausts (ei from fastfiat, lower down the exhaust page) are renouned to be the best aftermarket exhausts from everyone I've heard who's got them! (I'm too cheap personaly!)
K&N, even though they seem to be the best make, are a thin 'paper' type filter, and so tend to get clogged up quicker than the foam filter type induction kits.
The only thing pretty much distinguishing between cheaper universal filters and big-brand name ones (other than flashy enclosed ones etc)is the brand name ones come with the exact size tubing. And that's about it! So if you find a nice universal one, just buy the tubing individually, or find pipes that will fit. Proper silicon hose costs a fortune, but other tubes of the right size can probably be found at scrappies, (or even in your engine bay- look at the tube linking your air-feed behind the radiator to the airbox- it worked on my 1.6 anyway!).
I personally got some ali tubing from my local Motorspares quite cheap (click my sig pic for pictures) and fitted a universal filter for about £55 all-in
It's each to their own MG really. I can't vouch for the Sportex as I've never heard or driven one. The Supersprint is on mine and is very nice. Can't recommend it enough. Nice sound (not chav-loud, quite subtle with a nice burble at tickover and nice roar under load which tails off nicely at steady speed) and power/torque are improved with the added bonus of improved fuel economy. My MPG has gone up 10% since it was fitted and seems to still be improving.