I don't tend to do many straight lager kits much, as I'm more of an IPA man these days, but I always had really good results with Cooper's European Lager and it is a lovely pint and similar to Becks (although Becks is brewed in the UK now though and isn't as good now though). I picked up a Wilko's Artisan larger kit a few months ago when they had their sale on which I'll be putting on soon.
Anyway, back to the European lager, I remember the once finding a couple of bottles in my stash in my garage that were 12 months or so old and it was excellent.
I was also a fan of the Mexican Cooper's Cerveza with a slice of lime.
It depends on the styles you like but hopefully a couple of good pointers for you.